Where is sand cloak form and trash cloak form of burmy in Pokemon pearl ?

Question

Where is trash and sand cloak Burmy in Pokemon Pearl ?

Answer 1

To get trash cloak, level up Burmy in a building. To get Sandy Cloak, level up Burmy in a cave.

Source:http://www.gamefaqs.com/ds/925601-pokemon-diamond-version/answers?qid=9420

(just had to google it......)

Answer 2

Burmy's form changes after each battle, depending on the environment it just battled in

So you have to battle in buildings to get Thrash, Caves/Sand to get Sandy and Grass to get Plant

Source