ludicolo is a grass and water pokemon, if you use swampert against ludicolo, i suggest that you use the move earthquake. If you use muddy water, it is not very effective.
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Your best bet is to teach swampert a powerful normal or fighting type move(Strength, hyper beam). No STAB move will work. If ludicolo has ANY grass attacks defeating it will be near impossible. Your best option is to simply get a bug, poison, or flying type to beat it. Note: Ludicolo has high special defense. use physical attacks (as mentioned above.)
swampert altaria breloom camarupt raquiza flygon this is my team and I've beat the game no that's rubbish try swampert/absol/breloom/camerupt/salamence/armaldo
Bertha has it beat her 5 times in the Pokemon elite 4
no swampert is a stater but it really Strong. I beat the game game without fainting it once. unless its because i 1 hit the other guy but, that's just me.
Ludicolo does not evolve into anything.