Mega forms and Alternate forms do not have weight since they aren't in the dex

[Ryuhouji]

This causes moves like heavy slam, low kick, and grass knot to malfunction when used against these mons in battle. The game gets the .weight field from the pokedex entries. If a mon does not have a dex entry (or if someone is doing a project that only features some generations) then the moves will not work.

[Ryuhouji]

I resolved this feature in my repo by adding a lookup table call to the function that actually returns weight. if this is something you are interested in checking out, let me know.

[DizzyEggg]

This doesn't happen atm, because the GetBattlerWeight function uses SpeciesToNationalPokedexNum which has all of the forms/megas covered.

https://github.com/rh-hideout/pokeemerald-expansion/blob/upcoming/src/battle_util.c#L8341
https://github.com/rh-hideout/pokeemerald-expansion/blob/upcoming/src/pokemon.c#L1257