Lift Key above ball glitch
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The Above Lift Key ball glitch is a glitch in Pokémon Red and Blue that allows the player to stand on top of the item ball that contains the Lift Key in the Rocket Hideout.
The player simply needs to defeat the Rocket Grunt, then talk to him again from his left. The item ball will appear under the player, who can still move.
In Pokémon Yellow, the Lift Key drops as soon as the Grunt is defeated, so the glitch isn't possible anymore without using a item triggering the Rival's effect, to clip into the Grunt, then going out on the left, and talking to him.