Question

If my beautifly has swarm in Platinum what are the chances of getting a snubbull on the route past Hearthome?

Answer 1

Its not the ability swarm that allows you to get snubull to appear but when dawn/lucas sister tells you theres a swarm on that route. you need to beat the elite four first.

Comments

So after ive beaten the elite four and I go that route I will see their sister telling me there is a swarm?

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no go to the house of lucas/dawn(thanks SF) and talk to the girl then she will tell you where a swarm is , it may not be the route you want