Northern part of Seven Island
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no trainer
Your Rival
you get punched in the face
There is no Pokemon colleseum in Pokemon fire red If you are talking about trainer tower it is the place where you select a Pokemon of your choice and battle trainers on every floor. You get a prize if you beat all the trainers
No trainer has that Pokemon in that game. But you can migrate it from Fire Red and Leaf Green I think.
There are old buildings where those dots are... they have nothing in them. Apparently, you have to go to the trainer tower and unlock the tanoby key. Then the unknown Pokemon will appear in the ruins.
die
If one of the trainer are playing it, then yes, fire red IS fun in fire red (this is MUCH better than the last answer...)
You need to get the Silph Scope.
You must have ground,dark,fire,water, electric and fighting Pokemon.
some ether, awakening, maybe a super potion