lv 16
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it will learn it at level 36
LEVEL 7,8,9
Butterfree learns confusion at level 12.
In Red and Blue, it learns Confusion at Level 12, two Levels after it evolves from Metapod. In every other game, it learns Confusion at Level 10, as soon as it evolves from Metapod.
Abra doesn't learn any moves apart from Teleport, but Kadabra learns Confusion when at Lv 16 (when Abra evolves)