either, you train your pokemon, think of strategies to catch it or get an action replay and download a cheat for it
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You keep on fighting Pokemon until you level up.
Level 50's and above Pokemon can be found in cerulean cave.
you have to either catch a legendary or raise a Pokemon
You can catch some at Sky Pillar.
You will need to level up Haunter to level 50 to evolve it in Pokemon Resolute.