In terms of sales:
3.Pokemon
2.Mario
1.Wii Name Games
In terms of "Core"
3.Mario(Not all games are "Core")
2.Metroid(I hate Metroid but in terms of what I consider "Core" Metroid is more "Core" than Mario)
1.Zelda(People cry)
In terms of me(My Favorites)
3.Mario(Who doesn't like Mario games?)
2.Star Fox(Star Fox 64 was amazing and may be my favorite Nintendo game on the N64 and Assault had a huge multiplayer mode while Adventure I didn't get into because it didn't feel like a Star Fox game to me.)
1.Pikmin(Pikmin was a great game while Pikmin 2 is my favorite game of all time to date. It is very creative and brings a unique and different game experience unlike anything else and I hope Pikmin 3 keeps up what the francise has done so far!)