* Route 210: After defeating the Gym Leader in Veilstone City, you can find Wartortle in the tall grass of Route 210, but only at night.
* Lake Acuity: Once you reach Lake Acuity, you can find Wartortle in the water.
However, it's important to note that Wartortle is quite rare in both locations. You may have to search for a while before finding one.
Here are some tips to increase your chances of finding Wartortle:
* Use the PokéRadar: The PokéRadar is a very helpful tool for finding rare Pokémon. You can get it from the Pokéathlon Dome after completing the Pokéathlon.
* Use a Repel: Repels will prevent other Pokémon from appearing, allowing you to focus on finding Wartortle.
* Try the "Chain Fishing" method: This involves using the Rod and constantly catching Pokémon in the water to increase the chances of finding a rarer Pokémon, like Wartortle.
Good luck finding Wartortle in your Pokémon Platinum adventure!