Pretty much any psychic Pokemon but I suggest Gardevior, Espeon, Alakazam, and Xatu.
Movesets
Gardevior
Psychic
Protect
Shadow Ball
Calm Mind
Espeon
Psychic
Shadow Ball
Trump Card
Protect
To Lazy to Do the rest check SMOGON
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I know you can get Drowzee just below Goldenrod City, before the Day Care. But there aren't that many psychic Pokemon to find. I know what you mean!!
You can find it in Saffron City from Mr. Psychic. Or I'm pretty sure you can buy it in a department store (not sure which one).
Psychic type Pokemon like Espeon, Drowzee, or Mr. Mime. Or flying-type.
it is actually a good Pokemon if you have 1 then you will just destroy Psychic type Pokemon
You can beat it easily with Dark, Bug, and Ghost type Pokemon. It is least effective by Psychic, and Fighting.