wonder guard is an ability that makes your Pokemon almost impossible to beat. What it does is it only allows super effective hits.
i have a question how do u get it?
get the Pokemon Shedinja.
Steps:
Get national Dex
Use poke radar in Eterna Forest
Catch Nidacanda
Evolve at level 20 With a spare space in your team
You have a Ninjask and 50% chance of a Shedinja
Chat with our AI personalities
get pokesav from pokesav.org and make a cheat for pokemon you want in pokemon diamond. ----
Im not sure if you ment 'wonder cards' or 'wonder guards', but a wonder guard is when Pokemon can only get hit with super efffective moves such as sheer cold.
It is not possible to get the ability wonder guard on a Squirtle. Squirtle is a water type of Pokemon.
The only way you could do that is to modify the pokemons ability with pokesav, personally i find that every Pokemon with wonderguard would be boring, so hence I'm not obliged to give out the code.
Shidinja is the only Pokémon with the ability Wonder Guard.