If you are getting Luc-combo'd off the map for a gimp kill, DI/drift AWAY FROM THE AURA POKEMON.
I know it takes prescience (and presence) to do it, not to mention balls, but anything you can do to screw up his aim, or give you a better chance for your return.... you gotta take it. Because when your death is assured if you play it the other way, why not try something different?
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As for this matchup... it should be closer to our game (still at least their slight advantage). Lucario has some weaknesses, like that floaty fall speed, which we should be able to annoy with our PK thunder.
I mean, Lucario user, what are you thinking if you get chased with PKT when you're high, or horizontally displaced from us (without AS)?
Ness probably wants to try to position Lucario for a gimp. I learned this in Chess, but apparently it holds as a general rule that someone who tries to play to trap or ambush the opponent, himself gives the opponent the ability to control his spacing and positioning.
I learned it through getting owned by an expert when I tried the former strategy (shortly after learning stuff on "key squares"). He then told me what I just said. He used what I was doing *the fact of what I was doing* to control me.
EDIT: I want to make clear this is not a reversal of the strategy. Lucario is doing X, and when you do X, you give the opponent the option for Y. Y kind of mirrors X, but it is not X.
So, correct me if I'm horribly wrong, but Lucario is a character that plays like me in that Chess game, right? So his opponents should be able - character-generally - to manipulate and maneuver the Lucario themselves. Inasmuch as Lucario is trying to be defensive, he creates that weakness in himself.
Then, given that we have this chink in his armor, I'm just thinking that Ness players want Lucario to die as soon as possible each stock, since their weight is comparable... and the way for that would be gimping. If we can move Lucario to the edge, we can then use our gimpy tricks like a bitter fair (nonsweet, I'm so clever), or forward throw, and then abuse Lucario's recovery.... and try to spike.
Or at least abuse him with PSI attacks for his recovery.