Looks good enough, but really don't think Meowth will make it when Jigglypuff is still around.
I think DLC would fit this perfectly.
After yesterday (After I looked over what I typed, I slammed my head into the wall repeatedly), I decided that maybe in order to fit some Pkmn characters, DLC would be involved.
So, let's just get this out of the way: It's possible to have 6 slots, but will* there be? Think about it, there's been 4 slots in melee and brawl (PT not counting). So, in order to resolve this, I decided that the most clever way is to go by fandom and relevancy.
Wii-U:
Pikachu
Jigglypuff
Pokemon Trainer Unova
Lucario
3DS:
Pikachu
Jigglypuff
Pokemon Trainer Kanto
Zoroark
Now, notice that we don't see our boys Mewtwo and such. Well, let's head over to DLC shop. Let's call it The Trophy Shop.
Shop:
Mewtwo, 4
Meowth, 3
Deoxys, 4
Victini, 3
Ok, notice I added numbers next to them. These are the "Keys" for the character. Ok, the Wii-U has more than enough data to hold, so this overall is very possible. Let's look at the original players:
Wii-U and 3DS:
Pikachu- 0
Jigglypuff- 0
Pokemon Trainer Johto- 5
Pokemon Trainer Unova- 5
Lucario- 4
Zoroark- 4
Now to get to what the point of my DLC idea is: additional characters= key addition. Let's put the basic Key configuration for Pokemon to... 15. So, let's see what we want.
Pikachu0+Jigglypuff0+Meowth3+Victini3(6)+Lucario4(10)+Pokemon Trainer Johto5(15)=15 Keys.
In otherwords, you can add characters by the Key slots remaining. This would work for all charcters. It's a simple and very possible concept in order to make yourself the perfect roster. Now, please note tournys are where problems would occur, but please keep in mind this game wasn't bulit just for competitive souls. An example of a roster set that wouldn't work:
Pikachu0+Jigglypuff0+Lucario4+Zoroark4(8)+Mewtwo4(12)+Deoxys4(16)=
16
So, simply put, if you want certain characters, you have to have enough remaining Key slots. If you do not, you have to turn off the character, which you would go to the Trophy Shop, and "Lock" the character. In order to obtain new characters, you'd have to unlock them in-game. For example, the "Lucario Slot" is unlocked by doing something significant.
So, any thoughts? Once again, it's Character Key#/15Key slots.