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Besides, can you play Borderlands 2 cross platform ps3 and ps4?
If you've already played Borderlands 2 and/or Borderlands: The Pre-Sequel! on Xbox 360 or PlayStation 3 (or PS Vita for Borderlands 2), you'll be able to transfer your save within the same console family.
Accordingly, can I play Borderlands 2 on Xbox with someone on PC?
Initially, after Borderlands 3 was announced, its Microsoft Store page listing indicated this it would feature "cross-platform co-op" between Xbox One and PC. The listing has since been removed, but if cross-play does make it to Borderlands 3, it's a good bet that Xbox One and PC will support it.
No you can't join games from other consoles. They don't share the same servers. You can only cross save, that is share save files between consoles.