that's easy there are two ways one buy it from the stage when SG and GG vs Squidzoid is on or get it from the treasure book
To see the giant squid on club penguin just go play aqua grabber! Oh and if you do see the squid you get a stamp.
There is not a squid you can find.
A giant squid period
You have to spot the squid in the corner at the bottom of Aqua-Grabber.
go on i have a code and put in squid tastic
at the pool underground
You wait at the bottom
at the plaza
Honestley i dont know im trying to find it
you just wait but i think i got lucky
The squid costume comes from the stage play
go on puffle rescue on the black puffle and follow the squid