You cant. you have to train.
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.
Level 100 same as all the other Pokemon games. :)
On Pokemon HeartGold, Moltres is on level 50.
level 100 i am shaqib and i beat heartgold, dimond, platinum, black, white, all of them actually .
there is but does not work
If its level 100 and you just started the game, than yes
train your pokemon up to level 80,90, or 100 and teach it TMs and HMs
sentret evolves at level 20 in Pokemon heartgold
Suicune is at Level 40 in HeartGold and SoulSilver.
you can train all your Pokemon to level 100 and finish the pokeathlon stuff like I did and Start a new game!
That is totally impossible!
In Pokemon Heartgold with this team, first train crobat to level 100. Then swap Ludicolo for Exeggutor with the ability chlorophyll.