SPOILER:
I've said it before and i'll say it again, Yoda's mind set was totally wrong at the time of the big duel with palpy. I truly believe that if Yoda went back and fought him again one on one, he would come out on top. The death of all the younglings and Jedi's, the surprise of seeing a sith lord for the first time, and him not having the mindset to actually fight to kill all led to Yoda's apparent loss to Palps.
I think even despite Yoda's age, he is still an even match for Palpy, he just didn't have a good mind set and he lost a close fight.
Well I think he goes into hiding for a good reason. He can't arrange another one on one fight, given the new situation after their battle. It was an opportunity for Yoda to kill palps, but due to his mindset, he lost the fight. I seriously doubt Yoda could ever get another chance even if he tried. Palpy has a whole army to defend him now, as well as his new b1tch Vader. It simply wouldn't happen, and Yoda knows that. So he hides out and waits for another chance, palpy style. Patience wins the fight, and Yoda does win eventually, by hanging out and training the one who indirectly brings him down in the end. By training Luke, he makes it possible for Vader to beat palpy. Palpy deceived the Jedi's for years, and with patience his plan came into action. Yoda did the exact same thing, by fleeing the fight after he was losing, and training someone who would get the chance eventually to bring him down.
Any way you look at it, Yoda's still the man 馃檪
Ok this is what would happen.
Yoda does all his freaky moves on Sidius while he blocks them all. Then Sidius would trys to electracute him but his super agility would dodge it all. Then Yoda tries to use the force to throw a giant pillar ontop of Sidius
but all Sidius does is finger him and use the force to throw it back. Then Sidius strangles Yoda with the force. Then either Mace or Obi won would come in and distract Sidius so Yoda can escape. Then Jaba the hut comes and uses his fat to sufficate Yoda and Sidius. In the end, THE FAT A$$ WINS! GO JABA!