It took forever for me to find him, but I found him next to Machamp's obstacle course.
the cavern zone
u battle it in the cavern zone
In the Cavern Zone, where Bastiodon's Block Barrage
Befriend Buneary, and he'll be waddling around the entrance to the Meadow Zone.
If you mean phanaphy he is in the cavern zone after u become friends with snorlax
he is in the cavern zone, sleeping in the hot spring.
magnezone: get all three magnemites, found in crates in the cavern zone, then the magnezone will appear.
after you beat hitmonchman in the lava zone go to the mine cart in lava zone then in carvern zone he is next to the hot spring
in the volcano zone
haunted zone
When you are far into the game, you will see Lavana with a Magmortar and you will have to capture it.
The magma zone