Pokémon - Season 1 Episode 74 The Ancient Puzzle of Pokémopolis Gotta catch 'em all!
Overview: While training, Ash and his friends accidentally uncover the ruins of Pokémopolis, an ancient city. After a bit of research, they find a giant Gengar and a giant Alakazam starting to fight. Then, a giant Jigglypuff appears to put them to sleep.