Question

How can I raise my Budew's happiness in Platinum?

Answer 1

You can do the following:
-Let it hold a Soothe Bell. It boosts the happiness gained from berries and massages.
-Feed it certain berries (Grepa, Hondew, Kelpsy, Pomeg, Qualot and Tamato).
-Level it up.
-Feed it Vitamins.
-Massage it in Veilstone City.
-Walk 128 steps (50% chance of raising happiness, only works if Budew has 0-99 happiness)
-Battle against a Gym Leader, Elite Four member, or champion.
-Teach it a TM or HM. (only works if Budew has 0-99 happiness)
-Use a battle item. (only works if Budew has 0-99 happiness)

Make sure you don't do these things, because they'll lower Budew's happiness instead:
-Let it faint.
-Let it survive Poison with 1 HP outside of battle.
-Use Energy Roots, Heal Powder, Energy Powder, or Revival Herbs.

How to check happiness:
-Visit a certain NPC in Hearthome City.
-Use the Friendship Checker on your Poketch.

Source

Comments

The soothe bell actually doesn't boost the happiness gain from taking steps. However, it does boost the happiness gain from berries and massages by a lot.

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Thanks for telling me. I edited that part of my answer.

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Actually, it boosts any happiness gain that's already greater than 1. I'm pretty sure it applies to everything except taking steps.

Answer 2

You can get special berries that raise it's happiness, but lower a stat. You can also equip a soothe bell and battle to increase Budew's happiness. Hope this helps :)