First trainer has ice types and water types, Second trainer has rock types and fighting types, Third trainer has ghost types and poison types, Fourth trainer has dragon types, Last trainer has all around types meaning there all different types.
Ghost types are weak against other ghost types and dark types so use those types to defeat that elite four member.
not realy get diffrent types in leaf green to beat the elite four
No its not an HM in leafgreen.
Nope.
get all the super effective types including for last one and defeat everyone and save
To open the Elite Four, you have to get all the Gym badges.
After you defeat the Elite Four.
beat the elite four once
train your Pokemon that's it.
Beat the elite four.
get her in icefall cave
train your Pokemon or trade strong ones