urm...maybe it sound hard but i've watch thiz pokemon movie that tell about pokemon called celebi who was caught by evil team by "Dark Ball" n then turn celebi into "Dark Celebi"...so...could u make this "Dark Ball" n any pokemon that caught by it will turn into evil pokemon n had it power double...i mean 25% of it power rises will be enough for the dark tittle...n to make it easy[i think] the pokemon that catch by this "Dark Ball" will not evolve anymore...moreover, this ball can be found on special rocket mart that hide in each town or city...i think u should add rocket's center b'cos we are grunt right?? so we must had our own pokemon center...to tell u the truth im no good on hacking....hope this idea is enough for u to consider....for other event if u wish to take it from me just PM me...i'll always on the comp....anyway sory for my bad english..
Interesting idea, but (like Mac_Mini said) not really feasible; and even if it were, that wouldn't be a good idea for this particular hack.
First of all, in game canon (at least the main game line, not counting stuff like Shadow Pokémon from XD), Pokémon that belong to Team Rocket aren't artificially turned evil. Several characters (including Professor Elm, I think) have said that if a Pokémon is evil, it's because it's obeying an evil trainer, and for no other reason.
Second, while a game might be made more difficult if the Pokémon you're fighting against is twice as strong as it's supposed to be, it's made a lot easier if
your Pokémon is twice as strong. In the original game, when you're fighting against the bad guys, the bad guys are supposed to be a lot stronger than you (or at least there are a lot more of them) because if you're twice as strong as the bad guys, the game gets boring.
It's fun in the original games when you fight against Team Rocket because you're a one-man battling machine, fighting against an army of hardened criminals, and so it's really cool and really amazing when you beat them all. Now I'm trying to turn it around, and suddenly you're just one little soldier in the criminal army, and the only canon opposition you have is this one guy who you're going to be able to beat someday. That's a huge shift in gameplay, and suddenly all the advantages are stacked in YOUR favor instead of the game's. I'm working hard now to power up the opposition so that it seems like you're really up against something that poses a genuine threat to Team Rocket, so that at the end when you prevail, it's YOU who are overcoming the odds, and not just helping the obvious happen. No matter what side you're playing on, you have to be the underdog for the game to be interesting.
But if you get special Pokéballs that power up your Pokémon (even if it prevents them from evolving too), that's stacking the odds in your favor again.
As for a Rocket Pokémon Center, I've already got something like that; the hidden Rocket bases (like the one under the Game Corner) will have nurses that will heal your Pokémon, and various towns will have Rocket operatives living in normal houses who will heal you, kinda like how in the original games your mom in Pallet Town will heal your Pokémon. No "Rocket Pokémon Centers" or "Rocket Marts" though, like a Pokémon Center or PokéMart but evil. Think about the real world--for example, its hospitals. Do organized criminals in the real world have a Mafia Hospital sitting across the street from a normal Law-Abiding Citizen Hospital, so that Mafia thugs can get their wounds cleaned in safety when the police shoot at them? If a criminal gets injured, he goes to other criminals for help by hiding out in their houses, or he bribes off doctors to come take care of him in an undisclosed location, or he uses his boss's connections to get into a hospital secretly and then secretly leave when he's patched up.
If you're on Team Rocket and you want to heal your Pokémon, you've got to find a Rocket Base like in Celadon or find someone else who supports Team Rocket. If you want to buy stuff, you find a Rocket with a stolen stash of Antidotes to sell, or a little kid that will sell you Poké Balls for $400 each (he's a little con artist, the brat), or a vending machine with Lemonade.
Sorry for the tl;dr, but I felt like if I'm gonna say I'm not going to use the idea, I should give some good reasons why--besides that it probably wouldn't work.
...On the bright side, you WILL be able to catch Celebi.
