OMG! SIG 'N' TESSA!!!!
This is SUCH a good way to introduce your characters and story to those who may not be informed.
It hooks you in and makes you want mooooooooore!

Animation is some good shiz, dude. You've really improved!
Those lines be so smooth, ya can't even tell that you used Flash for this.
Nice head-turns. And I really like how the camera turns in the fight scene near the end!

Your writing has this Iyashi-kei tone to it, that leaves you with feel-good feels.
Your writing style is a huge strength you have that sets you above other animators.

The reason I took off a half star was the line weight is inconsistent at the 1:04 mark when he leaps back in space. The line weight may have technically stayed the same, but in proportion to the figure in the rest of the shots, it looks thicker.
Another reason is the timing/speed on the rolling BG at the 1:07 mark didn't seem in sync with Sig's run cycle. It's off by a hair. That must have been a hard shot, so I have to give ya props for pulling it off! But that's all that really stuck out to me.

All-in-all, great animation, great writing, and I can't wait to see more of Sig 'n' Tessa!
I'll be sure share with ALL the peeps!

I still can't believe you went through with animating that one shot by hand the old traditional way! Must have taken loads of work! Regardless of this being a my little pony parody, I have to applaud you for that amount of effort put towards an animation short and how seamless that shot fits in.

HEY! DIS IS JUST DA SAME TING!

...BETRAYED!

Thanks, bro. It's helpin' me fall asleep. MUCH NEEDED SLEEP. AND TO BE HONEST...LOL...I agree with you Ray, I like the drums as they are, LOUD. Also, I know you love beat-boxing...but it felt so out of place at the end.

What CarnieVorex said and

Pay attention to your color a little more:
Adding a lighter tint (pulled from the sky's blue) to the Altaria in the back will show depth. Adding a little bit of a rim lighting on Xerneas's silhouette from the light source would make him (it?) less like a black blob...
I'd even say replace the black in your image with the darkest shade from your nearest environmental hue. For Xerneas, it'd be that bluish-green in the cliff.

Oh and I must complement you on your lovely and honorable addition of the rare Floating Tree.
Kids these days...they just don't know how to appreciate such a marvelous works of nature

NIce color scheme, bruv.

I can give a proper critique if you would like. :)