Gold

Gold is the 3rd intruder featured in Diary of a Tourney Kid, originating from Pokémon Lost Silver.

Tournament
Gold and Evil Morty collaborated with Fawful. (The Ricknorance of Mort)

Gold faced Greg Heffley, Opal, and Lost Children in Round 0.

Gold faced Kebin & Ian and Evil Morty in Round 2 of the loser's bracket as a boss.

Trivia

 * Gold isn't from Another Unnecessary Tournament.
 * Gold is from Diary of a Tourney Kid.
 * You can join their Discord server here.