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Solaris_Noid
If you ever find yourself using Double Team for countering moves no matter if they come from behind or in front of you, always always always use the Reverse option instead. In case you don't quite recall what it is & want a recap about what & how to do the RDT option:
Lucario reappears from behind him when using RDT, unlike the regular DT's reappearance which starts in front of Lucario. From the RDT's starting point Lucario reappears at, to almost the entire slide distance is a sliding kick attack, which means Lucario can hit characters from behind with RDT, unlike DT which can only hit characters in front of Lucario.
To perform the Reverse Double Team hold towards the opposite direction that Lucario is facing the moment your DT is activated. So per-say you're looking towards the left, you can immediately hold towards the right for RDT to work. If you're looking towards the right, hold left.