You will have to use a secret trap which can be found in the "Sources and related links" section. It will tell you about them, and how to get them.
on a capture invizimals quest were you have to stop it by blocking with your hand
No you cantThe trap is the most important thing in Invizimals (and the PSP camera) if you lose it i suggest borrow someone Else's or get another one (it has to be an Invizimals trap card only).
Who knows. Everyone has their own opinion
You can get it by special traps.
fighit in the internet
You need to capture FIVE MUTANT Invizimals, it should then do something or other on Infrastructure
u get it after u max all the guardian invizimals and then complete the tornament
some where arund summer
win any torament
go to google,type secret traps for invizimals shadowzone scan,enjoy your new invizimals!
six of them require secret traps other have battles or alliance ranks to get
You get Sackboy by becoming a level 20 in the alliance, and you get Unicorn by collecting and evolving all of the Invizimals to Max.
in the first invizimals you have to google it like:invizimals 1 uberjackal trap and in invizimals shadow zone i think it is by a bet in tailandia(not sure)
Just click on this link and it will tell you everything: What_is_the_big_secret_on_invizimals