[Not a bug] Ice Punch not super effective to Tranquill?

[Rayschrantz 0]

I just reached Agate Circus and battled a Tranquill which ended up not being weak to my ice punch. I don't know why this was, but unless I'm an idiot and the entire internet is wrong, then Tranquill should be a Normal/Flying type which should be weak to ice type moves. I haven't tested this with any other ice type moves, but I just though I should note it. Not that it's a major bug that could make or brake the competitiveness of the game, but it's still something to note.

[Lugruf 50]

It was windy probably. Wind removes their weaknesses to flying types so that they take neutral damage from ice, electric and rock. Strong wind in Reborn is basically Rayquaza's ability.

[Imperial 19]

Are you really sure of that ? I never heard the effects of weather were changed in Reborn. Wind doesn't even appear in battle, it's just for events. Rayschrantz, are you sure Tranquill didn't used Roost ? In addition to healing the user, it removes its flying type for this turn.

[mde2001 236]

Nope Lugruf was completely correct in that it could be weather, as reborn does have custom wind which does delta stream. Of course using roost would be another alternative, but it isn't a bug either way.

[Rayschrantz 0]

There definitely wasn't any wind, but it always could have used roost. But I'm pretty sure it didn't because it never healed itself once and I out-speeded it first turn, so it couldn't have used it before I used ice punch. This doesn't mean that I don't think roost or the wind didn't cause it, because there could be a bug that caused the effects to be present in the battle. I guess we'll never be able to know for sure since there isn't any way to recreate the conditions exactly.