In the main games there isn't a way to reduce a pokémon's level, but in the Mystery Dungeon games there is a seed called Doom Seed that lowers the pokémon's level by one.
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you hold down ctrl shift and ~ (above the tab) and type 'book of identify' and then hit enter. pick it up and right click on it. then left click on the unidentified item....
The duration of Item One is 1.28 hours.
item number 8875632 anal beads
You have to press A near an item/weapon!
katana