Seel evolves into Dewgong at level 34.
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Seel.
You can't evolve Yanma in Leafgreen. This is because Leafgreen was made before Yanmega was made. So basically in Leafgreen, Yanma is a Pokemon that can't evolve.
lvl 34
at level 34 seel shoud evolve into dewgong
You can't on leafgreen.