As I said, the Swiss versions are confined to Switzerland, normal Pikemen can be trained where ever you have a County Militia (Fortresslevel) and you are either Russian or Catholic. Byz and Muslims don't get them.

Since Swiss Pikemen and their Armoured counterpart are both Late units nobody can get them as the Swiss are independant in the Late period.
The Swiss Halbardiers are High so the HRE can get them as Switzerland is part of the HRE in High.