there around lv 45.
Nope.
You simply cannot.
you get too the elite four when you beat all the gym leaders in the johto region
we can get it by defeating the johto elite four
There are Pokémon from Johto in Leaf Green, however you can only find them on the Sevii Islands. (That is after you beat the Elite Four)
there is no elite four for kanto u just defeat the elite four that is in kanto for the johto region. and my advice for it is have the Pokemon the elite four Pokemon and the champion Pokemon are weak to like for champion it would be ice.
you beat the Johto elite four first.
Yes, after beating the Elite Four, they will be roaming Kanto.
You need to complete the gyms and the elite four in johto first
You have to have all 8 Johto gym badges then he'll let you pass and the you're free to challenge the Elite Four
No, because there is no double battle in the elite four
If you mean Suicune, you have to defeat the Johto Elite Four again.