I decided to do something a little similar to the drawing for the eqg 10th anniversary, since both dbz b.o.g and eqg released in 2013.
And both Dragon Ball and MLP will be celebrating the 40th anniversary in 2024, my two favourite franchise.

Context;
Put dragon ball z episode introduction music over here
"40 years of rivalry"
Says the narrator.

We find ourselves in a place, the world in between, a hub that connects different universes and timelines together, with the different timelines and universes being allowed to merge once a year for recreational and commemorative purposes, outside of the not so rare event of a blue unicorn messing with the time and bringing someone from the past with her.
But with that aside not much happens.

At the present, we find ourselves in the setting of a large prairie biome with twilight's castle and the crystal brighthouse on the horizon.

Goku who during the hub connection met with Razzaroo, a friendly earth pony mare that he instantly befriended, the two then we're teleported to the castle where they met rainbow dash and Firefly.
Razzaroo making the connection with the g4 rainbow because of her friend (g3 RD).
But the pink Pegasus with her blue mane picked goku's interest, her intrepid and erratic movements while flying causing goku to remember his many trainings.

(Time skip because I'm out of ideas)

Goku Razzaroo Rainbow dash and Firefly went out to see some of the merged world, with the two pegasi a bit further way from them, when suddenly Firefly snapped back towards rainbow dash and with a powerful blow shoved her hoof on rainbow's gut, making her spit out blood and onto the ground.

"I'm the original, Lauren might've hated my gen, but i was the first.
You really thought that a cheap knock off like you would be worthy of being my successor?"

She spat out the words after delivering the nearly fatal blow.

Goku and Razzaroo looked at her, horrified by the sudden change in her behaviour

"Rainbow dash!"
Shouted the pair seeing their friend state.

"Why'd you do that!?"
Shouted goku

"None of your business"
Replied Firefly

"That's enough Firefly!"
He shouted back

"Bring it on!"
She shouted rearing up into a fighting stance.

(I'll prolly do a 2nd part, or just goku getting his flanks kicked by Firefly)