There are three characters that have "tether" Up B's (Well technically there are 4 but I'll explain that in a bit)

Olimar and ivysaur's up B's put them into a "free fall state" (meaning you cant do squat once their up B's are used) but zero suit can actually multi tether cause her side B AND Up B can tether as well. She is the only character that can use her Up B (thats a tether) and still tether again.

Ice climbers up B is technically considered a tether recovery but they at least have over B still as a recovery option.

This information is important kerrod because tether recoverys can be gimped in this game. As a ivysaur lover and main this is the most tragic news ever. However your gonna find olimar to be pretty durn annoying so just grab the ledge any time you knock him off. He wont be able to sweetspot because your already occupying the stage. Oh and Zero suit samus is soooo cool. Have fun with her ey?