First,you need a fire type with lots o defense and special defense
Then Golem
Then a grass type like weepinbell or ivysaur,it should have razor leaf
A steel type with lots of special defense,but maybe steelix
Also vaporeon
And last of all,your choice,but I chose primeape,he's really nice against piloswine,ursaring,cloyster and dewgwong
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After you beat pryce in mahogany town
it depends what one you want but just beat all thegyms and you will get some
try to use a giglarchan or maybe a tigra it would help
mk after you beat that old man pryce. you head on to blackthorn via the ice cave, pick up waterfall while your in there, and battle Clair the dragon lady, just make sure you've dealt with team rocket in the radio tower and such.
No but you can rent a Mew. Complete all the Stadium modes, the Gym Leader Castle, and beat Mewtwo in the VS Mewtwo mode and you will be able to select Mew as a rental pokemon in the Prime Cup mode.