http://www.serebii.net/events/dex/686.shtml#2013 Inkay Happy Hour cannot be merged with its hidden ability Infiltrator Pikachu/Eevee/Vaporeon/Jolteon/Flareon/Espeon/Umbreon/Leafeon/Glaceon/Sylveon knowing Celebrate cannot be merged with its hidden abilities respectively... They all can be found here http://www.serebii.net/games/eventmoves.shtml
The post before and after this were 2 different threads that related to the same issue: Events have no validity checks against other events relating to any pair of: pokemon, move, or ability. Only move-move has a validity check.
on PO you can use Cosplay Pikachu + egg moves as long as you don't give him the cosplay moves. It's not a serious bug, it makes it so you can dress up your pikachu and give it egg moves as long as you don't give it the cosplay moves. Cosplay Pikachu can't have egg moves on 3ds, but on PO it can have egg moves, past gen tutors or HM/TMs as long as it doesn't have the special cosplay move. The way it is now, it's, "You can dress up your pikachu as long it doesn't have a cosplay move. (Draining Kiss, etc.)
Thought I mention that because it's related to the post on forms. Keldio is able to use Keldio-R only move Secret Sword which makes it evolve into Keldio-R. I imagine appearance is important to predict what that Pokemon knows. Edit: If I'm correct this was only allowed in BW1.
What I mean is that Cosplay Pikachu can't breed, so it can't have any egg moves. It also can't have past gen tutors or TM/HMs. On PO You can still give any Cosplay Pikachu forme egg moves/past gen tutors/TM/HMs, as long as you don't give it's respective move. This is a bug. Pikachu-Belle can never have Volt Tackle. Yet on PO, you can have it as long as you don't give it Icicle Crash.
I was able to remove Pre-Evo and Egg moves from 6th gen. I just can't figure out where it is adding past gen moves...
Well, I'm talking more about in the MoveMachine. The moves shouldn't appear at all on the listing. I suppose though we could fix the validation part, but id still like it if the moves never even appeared on the list (so people don't get error messages for half the moves they try). I added a check in there anyway to address the issue for now for Cosplay Pikachu. EDIT: PS, Pikachu did get Celebrate and Lightningrod.