You can find them in the safari zone.
evolve maril
yes
route 345
You need to raise it to level 18.
There is no best Pokemon on Pokemon HeartGold.
there is no Pokemon Mansion in Heartgold.
They are not in Pokemon HeartGold
where is the pokemon transfer lab in heartgold
Herman Maril was born in 1908.
Herman Maril died in 1986.
Manninte Maril was created in 1980.
It evolves in Level 18. Easy and Nice. Hope I helped :)