I'd like to point out that Seed Bomb Pachirisu probably won't be very useful, since the little critter already gets Grass Knot. Then again, with this, lolphysical Pachirisu? Spark/Seed Bomb/???/??? lol.
Seriously though, with all this stuff, Game Freak's going to have a hard time topping this with the next "third game", I mean:
Yellow: All starters, Pikachu with voice and new moves learned (which is still the base for its learnset even now)
Crystal: Animations, first Battle Tower, new learnsets for stuff (Suicune and Eevee, the latter of which as of Crystal had THREE different learnsets: RB, Y and GS, and C), move tutor, play as a girl
Emerald: Animations return, breeding improvements, both weather ubers, more move tutors, Battle Frontier, out-of-battle ability effects, Gym rematches, Johto starters (for people without a Colosseum or XD), crappy RNG lol. (no new moves in learnsets, although FR/LG did that)
Platinum: We still don't know the full extent of what's in this one.
I'm sure I've missed some stuff, and I'd hate to have to try to outdo Platinum.