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Introducing the Pokedex package!

daveparr profile image Dave Parr Updated on ・5 min read

I made an R data package to make Pokemon data more usable in R!

library(pokedex)
library(tidyverse)
library(knitr)

How many Pokemon in the package?

I’ve tried to make the data set ‘tidy’ from the start, so we can use
summarise to count them, and kable to make some dev.to friendly
markdown tables.

pokemon %>% 
  summarise(count = n()) %>% 
  kable()
count
807

Types

Types are pretty key to Pokemon. Lets have a quick look at the Kanto
starters and types.

pokemon %>% 
  top_n(n = -9, wt = species_id) %>% 
  select(identifier, type_1, type_2) %>%
  kable()
identifier type_1 type_2
bulbasaur grass poison
ivysaur grass poison
venusaur grass poison
charmander fire NA
charmeleon fire NA
charizard fire flying
squirtle water NA
wartortle water NA
blastoise water NA

Single and dual types

So Pokemon can have either 1 or 2 types. What’s the split between single
type and dual type Pokemon?

pokemon %>%
  mutate(dual_type = case_when(is.na(type_2) ~ TRUE,
                               TRUE ~ FALSE)) %>%
  group_by(dual_type) %>%
  summarise(count = n()) %>% 
  kable()
dual_type count
FALSE 405
TRUE 402

So, it’s nearly a 50:50 split of Pokemon that are single type to Pokemon
that have 2 types.

How many by type?

But there are also quite a few types of Pokemon. Starting with the
primary type, lets make a quick chart to understand the distribution of
primary types. Using group_by will mean the summarise gets
calculated per group. We can then pipe directly into ggplot for a
col chart with geom_col.

pokemon %>%
  group_by(type_1) %>%
  summarise(count = n()) %>%
  ggplot(aes(x = type_1, y = count)) +
  geom_col() +
  labs(title = "Pokemon by primary type")

Pokemon by primary type

Lots of water type Pokemon, and lots of normal type Pokemon, but very
few flying types. Interesting. How about the secondary types?

pokemon %>% 
  filter(!is.na(type_2)) %>% 
  group_by(type_2) %>% 
  summarise(count = n()) %>% 
  ggplot(aes(x = type_2, y = count)) +
  geom_col() +
  labs(title = "Pokemon by secondary type",
       caption = "For Pokemon with dual type")

Pokemon by secondary type

Look at all those ’mons with flying as a secondary type! The thing is
that, game-wise, the order of the typing doesn’t matter. We can easily
count the occurrence of a specific type in either primary or secondary
position with pivot_longer.

pivot_longer is actually a newer tidyverse function. It is
complemented with pivot_wider and this pair are intended to eventually
replace spread and gather. By filtering out the NA I remove any
observations of secondary types for Pokemon that don’t actually have
them.

pokemon %>% 
  select(identifier, type_1, type_2) %>% 
  pivot_longer(-identifier, names_to = "slot", values_to = "type") %>% 
  group_by(type) %>% 
  summarise(count = n()) %>% 
  filter(!is.na(type)) %>% 
  ggplot(aes(x = type, y = count)) +
  geom_col() +
  labs(title = "Pokemon by either type",
       caption = "This will count a dual type Pokemon twice,\nonce for each type")

Alt Text

So is there any consistency in order at all?

pokemon %>%
  filter((type_1 == "ghost" & type_2 == "fire") |
           (type_1 == "fire" & type_2 == "ghost")) %>% 
  select(identifier, type_1, type_2)
## # A tibble: 4 x 3
##   identifier  type_1 type_2
##   <chr>       <chr>  <chr> 
## 1 litwick     ghost  fire  
## 2 lampent     ghost  fire  
## 3 chandelure  ghost  fire  
## 4 blacephalon fire   ghost

It doesn’t look like it. a ghost fire Pokemon and a fire ghost
Pokemon both turn up. I’d like to see what the coincidence rate is of
each type in dual type Pokemon, so I need to get some ordering in. I can
use case_when in mutate to create a two new columns in the data. I
can make 2 in one call because mutate supports multiple expressions,
each of which names a column, and then operates conditionally on the
other 2 type columns. These new columns will:

  • always have a value in the column type_1_ordered
  • if the Pokemon is dual type, have a value in type_2_ordered
  • always have the types alphabetically ordered between the two columns. i.e. it will always be fire, ghost, never ghost, fire.
pokemon %>%
  mutate(
    type_1_ordered = case_when(is.na(type_2) ~ type_1,
                               type_1 < type_2 ~ type_1,
                               TRUE ~ type_2),
    type_2_ordered = case_when(type_1 > type_2 ~ type_1,
                               TRUE ~ type_2)
  ) -> pokemon

What might the distribution be of the flying secondary type, per primary
type?

pokemon %>%
  mutate(type_combined = case_when(
    !is.na(type_2_ordered) ~ paste(type_1_ordered, type_2_ordered),
    is.na(type_2_ordered) ~ type_1_ordered
  )) %>%
  group_by(type_combined) %>%
  summarise(count = n()) %>%
  arrange(desc(count)) %>%
  mutate(type_combined = as_factor(type_combined)) %>%
  ggplot(aes(x = type_combined, y = count)) +
  geom_col() +
  labs(title = "Count of Pokemon by dual type",
       caption = "Ordered by count") + 
  theme(axis.text.x = element_text(angle = 90))

Alt Text

So the most often occurring dual type is flying normal. That explains
the first 2 charts. It’s a bit tricky to see the rest though. Lets make
a more useful plot.

pokemon %>% 
  group_by(type_1_ordered, type_2_ordered) %>% 
  filter(!is.na(type_2_ordered)) %>% 
  summarise(count = n()) %>% 
  ggplot(aes(x = type_1_ordered, y = type_2_ordered, size = count)) +
  geom_point() +
  labs(title = "Coincidence of a particular dual type")

Alt Text

So flying normal has the biggest count, with there being quite a few
bug flying. That makes sense, as so many bug Pokemon have wings!
There are also lot’s of bug poison and grass poison. That makes
sense too, as so many bugs and plants are poisonous! How many Pokemon
have unique types though?

pokemon %>% 
  group_by(type_1_ordered, type_2_ordered) %>% 
  filter(!is.na(type_2_ordered)) %>% 
  summarise(count = n()) %>% 
  filter(count == 1) %>% 
  ungroup() %>% 
  summarise(count = n()) %>% 
  kable()
count
24

24 Pokemon have unique dual types. Out of 807 that isn’t very many!
Maybe these Pokemon might be particularly useful? I’ll try and work it
out…

Game Over

This post has been a simple example of both the data in the package, but
also the tidyverse methods of doing Exploratory Data Analysis. You can
find out more about tidyverse here

I got the raw data from this repo by
veekun
. My package is available
here, and the particular version
I used for this post is
here.
Though it’s in a pretty raw state, I hope to improve over time.

I made this package to have a bigish, diverse set of data to play with,
that lots of people recognise, and that has some inherent real world
application. Pokemon is a huge franchise with multiple instalments. Lots
of people have played it, and even if you haven’t you probably have an
intuition about what a Pokemon is, and what data about a Pokemon might
make sense, and mean in context with other Pokemon. Feel free to fork
and mess around with as you like. I hope its fun, and maybe even
useful!

Discussion

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