Where did the Butterfrees in National park go?

Question

when I went to the park thing I could not find a butterfree why

Answer 1

You can only catch it when you're doing a Bug Catching Contest.

Source

Comments

thanks that really helped but i have found them there when i wasn't in a bug catching contest

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butterfree only appears in the national park during a bug catching contest, as does beedrill, scyther, pinsir, venonat, and paras.