after you beat the elete four go in tall grass and you will find level 50 Pokemon there.
In Diamond and Pearl it's level sixty-one. In Platinum, it's level fifty-eight, then level seventy-four when you rematch her.
You level him up on a high friendship level, I suggest the "sooth Bell" found in the Pokemon Mansoin second room to the left.
You have to get a streak of fifty.
lv. 30 platinum
Giratina is level 47 in Platinum and level 70 in Diamond and Pearl
You can find wild lickitung around route 215, but they will only be at level 20. If you want one with a higher level, I suggest you migrate it from an older game.
it is level 36 on platinum
at level 34
Level 35
Level 33.
Level 42
level 55