By cheating
In Pokemon Soul Silver, Suicune is at level 40! ^_^
the answer is level 20
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 50
The exact level depends on which Pokemon it is.
In the game you have to battle alot of Pokemon till your Pokemon level up.On a pokewalker a hundred steps is a level up,but your Pokemon can olny level up one.
Mt. Silver. It has the highest level wild Pokemon and has the trainer red whom has Pokemon level 80 - 88. After that the next toughest area is the Pokemon league
level 36
Level 55
Level 18.
Level 40.
level 30