To go to route 222, you must have beaten CANDICE (7th gym of sinnoh) and battle or catch DIALGA (ruler of time).
Then go/fly to PASTORIA CITY, leave the city by taking the route 213. Finally when you reach the HOTELS(near valor lakefront), go through route 222 (the man will not block the passage now).
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pokeradar on route 222
No, but skitty can be caught on route 222 in Pokemon diamond pearl and platinum
You find octillery on route 222 near the beach (you need to fish with a super rod).
You can't find a Glameow in Pokémon Diamond. You'll have to trade it from Pokémon Pearl, where it can be found at Route 218 and Route 222, with respectively a Rarity of 15% and 20%.
route 222