Without using cheats, it is impossible to get a level 200 Pokemon in Pokemon Diamond. However, if you use an action replay, which is a cheating device that alters the games state of play, you can alter the game and make it show a level 200 pokemon. However, cheating has dire consequences in some cases.
I know that you can because i have a level 200 rayquaza on my Pokemon diamond game. It does however require an action replay and i don't know the code for it but i promise that if i find the code, i will edit my answer with the code in it.
only if you cheat
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Ponyta evolves at Level 40 in Pokemon diamond.
Train your pokemon.
level 100
Cranidos is a Rock type Pokemon that can be revived from a Skull Fossil in Pokemon Diamond. It will evolve into Rampardos at level 30.30
At level 25 in Pokemon Platinum but I'm not sure about it in Pokemon diamond and pearl