You can use a move such as Sweet Scent that lowers a Pokemon's evasiveness. You can also use a move like Swift, which is guaranteed to be 100% accurate. You can also just keep hitting with any move until a hit lands.
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hit a wall
Fighting type moves will hit if the Pokemon had used Foresight, or if the Pokemon has the Scrappy ability, which allows Normal and Fighting-type moves to hit Ghost-type Pokemon.
Hit points
hit it with some pokerocks
this depends how strong u are. u shud be able to kill Pokemon in one hit if u r in the firstest place ever in the game and u r at least level 50