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Get perfect IVs:You can do this by breeding in certain ways. I am not very familiar with them, so it would be best to google “IV Breeding” to learn more.
Max out EVs:Really not much to say here. Get 252 EVs in the stat you want to max out. 255 won’t get you any more than 252, as it is 1 stat point per 4 EVs.
Get a beneficial nature:Again, really nothing to say here.
If you don’t know what EVs or IVs are, check out the EV and IV pages under “Game Mechanics”.
If you mean species as in type, then first of all get a list of all the types and find the one with the highest base stat. for example blissey. its a normal type and has 255 base hp. then ev train it by killing heaps of Pokemon that yeild hp evs like stunfisk. stunfisk gives 2 evs and with the power wieght will give a total of 6 evskeep track of your evs becuase you cant find out any other way
hope I helped