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10 year old me stumbled into the Sky Pillar in Sapphire, and witnessed this massive Shenron looking dude that wrecked my entire team who cemented his status as one of my all time favorites
Then Emerald came out and went on to becoming one of my favorite games
Then PMD came out, and made him the final boss that got one of the toughest fights in the game, and then an awesome cut scene of him destroying the meteor
Then ORAS came out and gave him an amazing looking mega, gave him his own story episode with tons of cool lore, gave him an awesome cutscene and space battle, and made him THE most powerful mon, as he deserves
Kyogre, Lugia, Lati@s and Solgaleo are all up there too, but it's hard to beat Fug