You can't unless you have cheats or whatever.
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level one hyper beam
the only way to get palkia is by trading from a friend, best way is the global terminal there are lots of offers to get one
at lv one . check marriland and serebii or bulbapedia
Well it really depends on what you are doing and what moves they have. At the moment I have a level 100 Palkia (Moves- Surf, Spatial Rend, Aura Sphere, Earth Power) that is my favourite and the better due to the fact Dialga's level is 88 and the moves i taught are mostly crap (moves- roar of time, earth power, cut, strength). They both do a good job of smashing other Pokemon. I'll get dialga up to level 100 (teach it some good moves) and vs Palkia. I'll get back to you on this one. Yeah I did this and Palkia SMASHED Dialga. But I think it still doesn't matter because you will rarely be versing hard Pokemon.
Torchic is a fire type of Pokemon. The only way to get one of them in Pokemon Pearl version is to trade it.