Can I use "Archie's Ace in the Hole" or "Maxie's Hidden Ball Trick" to put a Stage 2 or Mega Pokemon directly onto my bench?
Yes, they're very sneaky like that.
Source: Primal Clash FAQ (2015-02-05), TPCi Rules Team (2015-02-05)

Relevant cards

Note: All applicable cards may not be listed below.
XY5_124
XY5_133
XY5_157
XY5_158