Where is a good place to train level 24 pokemon to level 30?

Question

I'm trying to train my kirlia to a gardivior.I also want to make it battle not my others.

Answer 1

Surfing along Cianwood, sniping off Tentacool and Tentacruel is the best way, without sharing the Elite Four.

Answer 2

Well it depends on the game but il tell you the levels
battle pokemon levels 15-18 and slowly it will gain good exp

Comments

I said where and one of the tags is heartgold

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I don't read the tags I read the question !