it is a item you can put in your secret base
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The trick house (I believe) is located on Route 110. If you manage to get pass all his tricks, you win a prize. In the end of it, he'll give a Tent to decorate your Secret Base. If you're playing Sapphire, you'll get a Blue Tent, and if you're playing Ruby, you'll get a Red Tent.
There aren't any Growlithe in Pokemon Ruby, but you can trade for them from Pokemon Fire Red or Pokemon XD.
YES, YOU DUMMY!(after you defeat the Pokemon League and get the Ruby/Sapphire.)
yes
Trade it from Pokemon Fire red