Where to find type matchups?

Hi all, hope your hacking is going well.

I'm messing around with types in pokeemerald, just changing the existing ones, and was wondering if anyone knew where the type matchup table can be found. Or whether there's any available documentation that would let me look something like this up myself. I'm using DizzyEgg's battle engine upgrade, if it matters.

sTypeEffectivenessTable in src/battle_util.c has what you're looking for

That's perfect, thank you so much!