Cause play websites
The most popular Halloween costume for medieval times is a knight. You can find out how to make a homemade knight costume here: www.coolest-homemade-costumes.com or buy one here www.buycostumes.com
you cant in any pokemon game
A costume store would be a good starting point or make them you can get inspiration in magazines
You can make an easy homemade one like I am. I tried it before it was fun!
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www.buycostumes.com has cupcake costumes to pick from. www.coolest-homemade-costumes.com/homemade-halloween-costume.html also has ideas, pictures, and instructions on how to make a cupcake costume.
Moon Costumes made a custom one recently and it seemed to come out well. Check the link below. Otherwise, I used the link: http://www.coolest-homemade-costumes.com/pokemon-costume.html the winning costume turned out well.
dress up as an evil rabbit.
go to a cosplay website they will usually have some sort of pokemon costume there.
There are many peacock costume ideas for children. peacockcostume.com/ and www.coolest-homemade-costumes.com or www.ebay.com/sch/i.html?_nkw=peacock+costume
Costume shop
There are plenty of Riddle Costume for all ages that you can buy at many halloween costume stores.