You go into the cerulean cave and find your way through it, buy lots of max repels. take a Pokemon with Surf, rock climb, rock smash. when you find mewtwo weaken him until he gets red health, paralyse, sleep him and throw poke balls at him :)
you can still go to cerulean cave to catch it like in firered and leafgreen
no
I havent played heartgold in a while but i believe the ilex forest is in other region as in not johto (btw there u can catch mewto and mew as well) 10 YR OLD OWT
That's impossible.
Yes,its level is 70.
you cant do anything because you did everything
you can catch kyoger, battle red on the top of mount silver, get mewto if you haven't already, and get wi fi events
You can't catch Rotom in heartgold.
you cant catch him in heartgold you can only get him in soulsilver
In HeartGold you can catch Kyogre.
in different places it depends on what game you have (in heartgold and soul silver he is hiding in cerulean cave id use a masterball)
Cerulean Cave but you need all Kanto Badges also use a dusk ball to catch it trust me I have it