either cheat or battle the as many trainers as possible
trade them to heartgold
On Pokemon HeartGold, Moltres is on level 50.
You can get a level one hundred Pokemon in HeartGold the same way that you can get a Pokemon of that level in other games. You have to level them up until they reach it.
sentret evolves at level 20 in Pokemon heartgold
Suicune is at Level 40 in HeartGold and SoulSilver.
take it to a Pokemon daycare after you beat bugsy and learn the move cut or get alot of rare candies or battle tons of trainers
That is totally impossible!
Level 36
Level 15.
level 30
level 31
level 20