Probably my rarest is my copy of Pokemon HeartGold with the Pokewalker! Got it as a present around the time the game came out; the Pokewalker needs a battery replacement though. I've also got Dragon Quest IV, V, and VI on the DS. I'm honestly kinda stunned they're worth so much now. Most of these are definite keepers, but I might eventually sell my copy of IV—I have the game on mobile now too, and the mobile version has the party chat feature, which was sadly cut from the English release of the DS version.
Not quite as rare as Fire Emblem Path of Radiance that I posted about earlier but I have Pokémon Yellow, Crystal, Firered, Emerald, and SoulSilver with the Pokewalker
I don't really know what games I own that would be considered "rare", lol. Based on what I remember seeing, I believe that the rarest games I own are Legend of Zelda: Majora's Mask (N64 version with the gold cartridge + holographic label, sadly never got the box or manual since it was used), Legend of Zelda: Ocarina of Time (the GCN version that came with pre-ordered editions of Wind Waker and contained Master Quest), Legend of Zelda: Collector's Edition (GCN) and Skies of Arcadia: Legends (GCN). I also have Pokemon SoulSilver (DS) with the original box + Pokewalker, which I guess would round it out.
My most valuable game is defiantly Super Smash Bros Melee for the Game Cube. And maybe my Haevest Moon A/Another wonderful life. My girl version is probably worth more then my boy version though.
I wouldn't say it's completely RARE, but I do have a copy of Pokemon Platinum, with the original box and even one of the little pamphlets for the Rotom event The cartridge has yellowed a bit though (I played the heck out of that game).
My eldest brother has a physical copy of WarioWare Twisted with the one and only holographic box, whereas I have it digitally on my phone
Furthermore, I have the entire Pokémon HeartGold set in a box, including the manuals and Pokéwalker, Pokémon Yellow, Mario Kart Double Dash, Pikmin, Pokémon Colosseum, Donkey Kong Jungle Beat with the bongos, and Super Smash Bros. Melee... otherwise, I can't really think of anything else I own in this way.
I have a copy of Cubivore for GameCube, Fire Emblem: Radiant Dawn for Wii, and some rarer SNES games, but I'm not really sure what counts as "rare" anymore, as opposed to just expensive, considering the recent spike in price of second hand video games lately.
I think the rarest game I own is Mike Tyson's Punch Out. In that particular version, Mike Tyson is the final person you have to beat in the game. However, three years after it was released, he has been replaced with Mr. Dream as he was no longer the champion at the time according to brief research on Google. Because of this and looking at the prices on Amazon and eBay, most prices are either near to that of games released nowadays or are in the triple digits!
I don’t know if this is rare, but I have “Hey You Pikachu!” I have the game cartridge with the microphone that you use to talk to Pikachu. Although all he seems to do on this game and Pokémon Channel is slap the television or have temper tantrums. I’m always telling him to tone it the hell down.
The cartridge has yellowed a bit though (I played the heck out of that game).
