Event script to count Pokémon by Type or Shape?

[JayCee]

So I am having a lot of fun fumbling through making my first fan-game but have hit a wall with one of my ideas. I want there to be an NPC who rewards the player based on how many different Pokémon they have seen of X type or body shape. Like, a badge or prize for seeing 10 different Dragon types or 40 Insectoid-shaped Pokemon.

I don't think I can modify player.pokedex.seen_count to filter itself like that. But I know the Pokédex can retrieve this information via its search screen as it displays a figure under Search Results but I cannot make sense of how a script would count this data in an event.

Thanks for any help!