hey, i have a few questions about the laboratory tasks:
1) once you have the rainbow ball, how do you get the rainbow mudkip?
2) if i purchase the rainbow ball and get the rainbow muckip, can i then do the laboratory tasks again?
3) if i can do it again, would the rainbow/shadow pokemon available be a mudkip again or would it become a different pokemon?

1) for right now the mudkips are not avaliable dont know why but zapdos said he will have a talk with da man about this
2) you can do this as many times as you want
3) you can only get the rainbow or shadow mudkip

1. Click on "Request Task!" and it will be found on any page at the bottom so you just have to search
2) Yes
3) No it'll still be a Mudkip

thanks for the help guys!
but by 'at the bottom of any page' what do you mean? at the bottom of any map or literally any page within the site?

Any page within the site. Maps, battles, town, buy page, sell page, etc.
But as alejanquq14 said some people have been reporting that the Mudkips are not appearing so might be an error.

yes at any page for example if i was in a battle it will appear like in here [you must login to view links] where the black spot is

read at the top of laboratory..the text says you can use the coins or lab credits to buy rainbow/shadow pokeball..then you have to battle the pokemon and catch it while u can..thats all i know..!!