Episode 66 and 72.
In episode 72, Yellow Zelkova comes back with a new shield that Eggman built for the Metarex. Knuckles and Sonic start to battle him. I don't like telling the endings to things, but you can watch it on YouTube if you type in the search bar: sonic x zelkova strikes back 4kidstv. Also, on Wikipedia you can type in list of Sonic X episodes and scroll down about 3/4 of the page. Hope I helped!
in an episode! Lol
Actually that's hyper knuckles that's pink, super knuckles is yellow like super sonic and super tails you see this is sonic heroes. super knuckles is also pink (i tried it).
Because Knuckles was being a lone wolf at the time
no he didn't
she likes knuckles and kissed him on his cheek in an sonic underground episode and knuckles secretly likes her
They are acuainted before the start of the series, as they know each other already in the first episode.
Episode 65: Mission:Match-Up.
OMG there's an episode where he cries?! I want to know to!!!!
He shows up in "Friend or foe" episode 18.
sonic tails knuckles
blu forng magnamimous