I'll bet you can using a protein from a pokemart , lilycove's department store to the north of the city or the market to the south side of the city.
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Look at it this way, if you try catching Kyogre ( full health, no status changes, and no master ball.) with a regular poke'ball, you will catch it right off the bat! your welcome.
to catch a Pokemon in Pokemon tower defense, drag the pokeball at the bottom of the screen onto the Pokemon you want when it is on low health.
You need to feed your monster.
You can get bulbasaur at this lady's house in Cerulean City. She is a Pokemon nurse who catches Pokemon and nurses them back to health
When you knock out a roaming Pokemon, it will faint and then start roaming again, but with its health at full.