You have to go to Driftveil city then you have to go to the big kind of house in the same line (vertical) as the Pokemon center go inside and talk to the ace trainer and he will teach grass pledge to your Pokemon
do not use grass type Pokemon on him
get a grass type pokemon, it can defeat water type. but be carefull of fire types.
mega drain in Pokemon is a grass type move that works better leech seed or leech life
make one of your pokemon learn the hm strength
The Move Deleter in Pokemon Black & White is in Mistralton City.
By moving clumps of grass in pokemon emerald.
Find someone who owns Pokemon Black and use the Entralink to enter their Black City. Talk to people in there as they may want to move to your forest (which in turn makes grass and trees appear in the forest)
grass knot
grass whistle
You need to go to a boy's house in Driftveil city and there is a move tutor with blue hair and you can learn grass, fire or water pledge.
Grass will move, walk into grass but it will wear off after a while.
it will only move if you have pokemon black or pokemon white.
A good Lightning pokemon or grass pokemon can get the job done. yes as the person above said a good grass and lightning pokemon will get the job done also make sure your grass or/and lightning pokemon is level 55-60 as his milotic is level 58. if u have a lighting pokemon make it sure it knows an electric move at least power 70+ same for grass pokemon electric pokemon move: discharge, thunderbolt or thunderpunch grass pokemon move: energy ball, solarbeam or leaf tornado hope this helps!
Frenzy Plant
In Pokemon Black and White, your Character will get the move charge after they have fully evolved to their highest point
apple
do not use grass type Pokemon on him