I don't know about Action Replay or Cheats, but you can get a Larvitar in the grass on route 207 in Pokemon diamond, but not in Pokemon pearl. It is very rare and will take a long time to find, and you need a pokeradar to find it.
On seven island go down until the area starts to get rocky and larvitar can be found in the grass next to the house there
It evolves at Lv. 30 into Pupitar. Pupitar evolves at Lv.55 into Tyranitar.
larvitar---> lv 30 =pupitar----> lv 55----> =tyranitar
Larvitar evolves into pupitar at lv 30 and then evolves into tyranitar at lv 55.
Larvitar evolves into Pupitar at Level 30 and then Tyranitar at Level 55.
Tyranitar can only be obtained in Platinum by evolving Pupitar and Larvitar. Pupitar evolves into Tyranitar at level 55 and Larvitar evolves into Pupitar at level 30. Larvitar can be found in swarms on Route 206 (below Cycling Road, south of Eterna City and north of Route 207). You can obtain information about swarms through news reports on TVs or talking to Dawn's or Lucas's sister in Sandgew Town.
Larvitar evolves into Pupitar at Level 30.
It evolves at Lv. 30 into Pupitar. Pupitar evolves at Lv.55 into Tyranitar.
Larvitar>>Pupitar= lvl 30 Pupitar>>Tyranitar=lvl 55
You get pupitar by evolving larvitar.
You must evolve Pupitar to get a Tyranitar. Pupitar evolves at level 55. To get a Pupitar, you must first get a Larvitar. Larvitar evolves into Pupitar at level 30.
Larvitar evolves to Pupitar at level 30.
Larvitar evolves into pupitar at level 30
You get a Pupitar, by letting it evolve from a Larvitar. That Larvitar you can find by using the PokéRadar at Route 207 with a Rarity of 12%.
Larvitar evolves into Pupitar at level 30.
larvitar-pupitar-tyranitar
You have to train a Larvitar to Lv. 30.
It is Pupitar.