Yes Entei, Raikou and Suicune are all available as rental Pokemon in Pokemon Stadium 2 you can choose them at any time as long as your not playing little cup rules.
yes
You can use one if you transfer one from one of your Gen 1 games. You can't get a rental Mewtwo.
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.
There is no rental Pokemon in in Pokemon platinum
First you must select the Gym Leader Castle, Stadium or Free Battle Mode. Second you must press A on Rental Pokemon the list of 149 pokemon will appear all you need to do is scroll down to any pokemon you want press A on it then press A on YES to register the pokemon depending on what stadium rule is in play you can choose up to six pokemon or even only one then compete against all six or three.
Mewtwo is not a Rental pokemon in pokemon stadium the reason for this is because there is a VS Mewtwo mode in the game and so his place is taken up there instead of in Free Battle. To use Mewtwo you must use the transfer pak accessory with Red, Blue or Yellow version inside then you must enter the Mewtwo you catch in the game then you can use him all you want but he will never be a Rental pokemon only Mew will.
you cant you cant
There are no cheats for beating them that are programmed into the game. Try going to gamefaqs.com if you want a good strategy and suggested team of Rental Pokemon to beat them. Be patient, you'll get those Rockets!
You can only get Mew in Pokemon Colosseum by trading him from another game. Mew is a psychic Pokemon that is said to contain the DNA of all other Pokemon. This allows it to learn all the HM and TM in the game.
there is... but i don't know yet..or go to the battle frontier and then to the battle factory here's the code : Warp to Battle Frontier 19C67C656689 94318B106757 Then talk to the person...bla,bla,bla...go in...your Pokemon will be on the safekeeping,then choose 3 rental Pokemon...activate the code...when you go to the door,you'll have the rental Pokemon ! (This is called stealing rental pokemons) carefull ! these rental Pokemon will erase your Pokemon party..!
No because you can't train them.
Well, you start out with Espeon and Umbreon, if that's what you mean.