Easy just get as many plant or water type pokemon and you will beat it
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use water pokemon lv 80 or higr
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get bubble beam on hm and there you go same on mtmoon2
you have to beat the first challenge on challenge mode or you have a 1.8 percent of getting it in the wild
use a jynx that knows perish song and use it when it is l.v 100
you have to use move like yawn whirlwind rest roar and helping hands
You need to go to the raido tower and get the pokeflute
beat brock in pewter city.
to pewter city
After you beat the Pokemon league, and get the national pokedex go to pewter city and get the rainbow wing from a person there. Then go to the top of Bell tower and ho-oh should be there at lvl 70 so bring a strong Pokemon ;)
It is in the top of Kanto after you beat the Elite Four.