Where can you check a Pokemon's Happiness In HeartGold/SoulSilver?

Question

I'm looking to evolve my Golbat into Crobat.

Comments

Really? you have to evolve Golbat with high happiness? I thought you just had to level him up. Hmmmm... looks like I treated it well.

Answer 1

There is a lady in Goldenrod City who will check your Pokemon's happiness. Her house is east of the Dept. Store and north of the Bike Shop (see outlined in red below).

She will make a comment about your Pokemon. Exactly what she says gives an indication of your Pokemon's happiness. Check here to see what each comment means. Your Pokemon needs 220 points to evolve next time it levels up.

Comments

There's also talking to the pokemon when it's following you

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Yeah, you can, but it is very vague and unreliable.

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True, I can tell it pretty well though