For Each System You Have...

GBA SP: Summon Night: Swordcraft Story 2 and Yggdra Union: We'll Never Fight Alone
DS: Dragon Quest IX: Sentinels of the Starry Skies
3DS: Rune Factory 4 and Bravely Default
Gamecube: Paper Mario and the Thousand Year Door and Legend of Zelda: Wind Waker
PSP: Final Fantasy IX (purchased and downloaded from PSN, so it counts >O)
PS2: Final Fantasy X
PC: Touhou Project 7: Perfect Cherry Blossom
Mac (if PC counts, so should this): LIMBO
iPad (this should count too): Puzzle & Dragons

 

DS: New Super Mario Bros.
3DS: Pokémon X
PS2: Dance Dance Revolution Supernova
PS3: Hatsune Miku: Project Diva F2nd or Tales of Xillia (can't decide >.>)
Wii: Super Mario Galaxy
Wii U: Mariokart 8
Xbox 360: Call of Duty: Advanced Warfare or Borderlands: The Pre-Sequel! (also can't decide ;c)
PC: Assassin's Creed: Brotherhood

 

SNES: Yoshi's Island
N64: Banjo-Tooie / Conker's Bad Fur Day
Gamecube: Super Mario Sunshine
Wii: Okami/Kirby's Epic Yarn
Wii U: Pikmin 3
PSX: Spyro 3: Year of the Dragon / Mega Man 8
Playstation 3: Sonic Generations
DS[i/Lite]: Pokémon Mystery Dungeon: EoT
3DS: Animal Crossing: New Leaf
GBA: Wario Land 4
PC games: Five Nights at Freddy's / The Ditty of Carmeana, if that one could even count... recently surpassed Minecraft because it's just so hilarious.

 

XBox: Knights of the Old Republic
XBox 360: Splinter Cell Blacklist
DS Lite: PM Explorers of Sky
3DS: Monster Hunter 3 Ultimate
Wii U: Legend of Zelda: The Windwaker HD
PC: Battlefront 2

 

Game Boy Advance: LeafGreen
DS: SoulSilver
PlayStation 2: Jak II
XBox: Batman: Arkham Origins
Wii: Super Smash Bros. Brawl
3DS: Omega Ruby

 

NES: Super Mario 3
SNES: Legend of Zelda: A Link to The Past
N64: Legend of Zelda: A Link to the Past
PS: Final Fantasy VII
PS2: Kingdom Hearts II
PS3: BioShock Infinite
PS4: Probably Destiny
Xbox360: The Elder Scrolls V: Skyrim
Wii: Legend of Zelda: Twilight Princess
WiiU: MarioKart 8
DS: Pokémon Platinum
3DS: Legend of Zelda: A Link Between Worlds
PC: Have to go with Team Fortress 2

 

NES: Super Mario Bros. 3
SNES: Super Mario World
N64: Star Fox 64
Gamecube: Kirby Air Ride
Wii: Mario Kart Wii
WiiU: Scribblenauts
Playstation: Spyro the Dragon
Playstation2: Star Wars Battlefront 2
Playstation3: The Last of Us
Xbox: Halo
Xbox360: Red Dead Redemption
PC: Civilization III
DS: Pokémon White 2/Pokémon Platinum
3DS: Phoenix Wright: Ace Attorney Trilogy (I hope this counts)

 

NDS: Kirby Super Star Ultra
GBA: Pokémon Emerald
3DS: Fire Emblem Awakening/Super Smash Bros.
Xbox 360: Ultimate Marvel vs. Capcom 3/Halo 4
Wii: Kirby's Return to Dreamland
Gamecube: Kirby Air RIde/Sonic Heroes
PC: League of Legends

 

DS: PM Explorers of sky
3DS: Pokémon Y
Wii: Super Smash Bros: Brawl
PC: Red Alert 2

I don't have many systems... ;n;

 

NES: Super Mario Bros. 3
SNES (Virtual Console): Super Mario RPG
N64 (VC): The Legend of Zelda: Majora's Mask
Game Boy/GBC: Pokémon Blue
GBA: Tie: Mario and Luigi: Superstar Saga/Pokémon Emerald
DS: Professor Layton and the Diabolical Box
Wii: Xenoblade Chronicles
3DS: Kingdom Hearts 3D (Dream Drop Distance)
PC: Tie: Touhou 11/Half-Life 2/Postal 2/Mount and Blade

 

GBA SP: Pokémon Emerald
PS4: Little Big Planet 3
PS3: Sonic Generations (don't ask)
Wii: Hard to choose...but ill go with NiGHTS Journey of Dreams.
DS: Digimon World Dusk
3DS: Rune Factory 4 and Pokémon Omega Ruby
PC: I don't know about any games on the PC...(yes i know i'm weird)

 

Oh god my systems/handhelds are pretty limited.

GBC: Pokémon G/S/C and Pokémon Trading Card Game
GBA: Pokémon R/S/E
DS: Pokémon B/W2? Animal Crossing Wild World? Honestly unsure here
3DS: Rune Factory 4
Wii U: Mario Kart 8
PlayStation 2: Okami
XBox: Blinx
PS Vita: Curry Saga

And.. yeah, that's pretty much it. I hardly played any non-Pokémon games on the GBC and GBA so naturally that narrowed down my choices a lot, though some of these were difficult to decide on.

 

Mine are:
GBA- Pokémon Emerald
PS2- Harry Potter Quidditch World Cup
3DS- Fire Emblem Awakening
PS4- Middle-Earth Shadow of Mordor
PC- Banished

 

GB: Pokémon Yellow
GBA: Pokémon Emerald
DS: Harvest Moon
3DS: Pokémon Alpha Sapphire
Gamecube: Pokémon Colosseum
Wii: Resident Evil 4
N64: Yoshi Story
PS1: Digimon World
PS2BZ Budokai 3
PS3: Resistance 2
Xbox 360: Mass Effect/Dragon Age

 

GBC: Pokémon Blue
GBA: Rayman 3: Hoodlum Havoc
NDS: Pokémon Platinum
3DS: Pokémon Alpha Sapphire
SNES: Final Fantasy III
N64: Star Fox 64
PS1: Driver 2
Xbox: TES III: Morrowind
Xbox 360: Banjo Kazooie: Nuts and Bolts
Android: Out There
PC: Garry's Mod / Freelancer

 

Hmm. Only one? Ack. Okay.

GBC; Pokémon Crystal
GBA; Pokémon Mystery Dungeon; Red Rescue Team
DS; Bleach: Dark Souls
Wii; Pokémon Battle Revolution
3DS; Pokémon Alpha Sapphire
PS1; Spyro: Year Of The Dragon
PS2; Jak 3
PS3; Ratchet & Clank: A Crack In Time (GOW3 is a veryyy close second, as is Ni No Kuni)
PS4; There's been nothing on this platform yet that has completely "wowed" me...but I did like playing Dust: An Elysian Tail
PSP; Daxter
PS Vita; Invizimals: The Alliance