^ basically that
Lucas' ground to air combat sucks and you'll either trade or end up getting hit in an effort to catch opponents falling down.
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Using triangle stages as an example (Battlefield, Dreamland, FoD in some cases, Yoshi's Story), but mainly keeping Battlefield in mind --
If you're down and need to approach, see how patient your opponent is first. Most people only try platform camping for a short while to get their opponent to throw out something unsafe so they can get a free punish. If the opponent is reluctant to approach (see: Westballz vs Armada game 1 at TBH4), then use the side platform to force them down onto the side platform / main stage.
If you're simply saying "jigglypuff & Wario jump in the air and use their back air to poke & approach at me, I need to counter this," then absolutely only stage grounded. Find openings between their hits and make them uncomfortable with tighter spacing. Best examples on how to close space vs Jiggs would be Mango/Armada vs Hbox. They are proficient at using their shield & wavedashing / dash dancing around these aerials.