The Ginyu Force is a rare villainous example parody. They got pissed when they realized that the heroes had killed off too many of their numbers to pull it off anymore. And they've earned something of an Ensemble Darkhorse fandom because of it, despite (or quite possibly because of) the fact that they were supposed to look genuinely stupid.
Meanwhile, Gohan tries to pull off something similar as the Great Saiyaman, but since he only has one partner and he's a massive dork to begin with, it just ends up looking ridiculous.
The ending theme of Haruhi Suzumiya ends up with the cast in such a pose, closing the Hare Hare Yukai choreography.
The Baka Rangers in Mahou Sensei Negima! had a way of doing this for fun. If that weren't enough, the School Festival arc had a group of entertainers called the Mahora Sentai who did this during their shows.
The Children of Zettai Karen Children absolutely love doing this. They even include multicolored smoke in the background! Now THAT'S dedication.
Koi Koi 7 has one by the Amazon Brigade it shares its name with. Though according to Ascended Fangirl Akio, the team was formed minutes before they appeared, so how they managed to work out such a synchronized pose is another matter entirely.
In Soul Eater, Death the Kid and his twin guns Patti and Liz will often go into a symmetrical formation (given Kid's Super OCD) in which Kid will be on his knees with his arms low to the ground, Patty will be standing over him with her hands behind her head and Liz above both of them with her arms outstretched like wings. Sometimes, whenever this formation is less symmetrical (such as one point during their debut episode, when Patti was off to one side), Kid would get mad and shout at them.
Parodied in Busou Renkin, where entrance to the LXE headquarters requires both a password AND the people seeking entrance to strike a pose. When the heroes attempt to get in, they do the same thing (to Tokiko's great reluctance)... only to realize that even if they did know the password, it'd be rather stupid for the LXE to just let any random people into their secret headquarters (leading to a flustered Tokiko to just get pissed and bust the door down.)
At the end of several Super Sentai series, the last episode inevitably involves the rangers having one last pose together out of uniform for one reason or another, (sometimes their powers are completely lost, sometimes they just feel like doing it out of uniform, sometimes they do it helmetless, etc.) and then finishing the Big Bad off for good. The feeling of Screw Destiny and True Companions in some of these cases is so powerful it's downright moving.
Interestingly, when different teams of Rangers team up, they do their roll call poses but the final team shot is of all 10-12 with their arms at their sides (as there's a big explosion in the background, followed by Ranger-colorcoded smoke clouds. Well, PR gets the smoke clouds.)
In circuses, at the beginning and the end, the members of an act usually come up and make a pose. (And if their act IS a difficult pose, then their starting pose is often a simple one, not related to the pose that is actually their act.)
Parodied in God Hand with the Mad Midget Five (a parody of sentai teams, of course). Their pose is to lie on the ground in a V-shaped formation... with their legs sticking up in the air in a V-shape. When defeated, they go into "Formation... C!" Which is turning to the side and grabbing each other's hips.
killer7: "D- did you see that? A real Handsome Pose!"
The main character of Suisei Tenshi Primaveil Zwei, the captain of a parody super sentai team, exults in the first ever defeat of the Magical Girl senshi parody, unconsciously strikes a Victory Pose as he cheers. His subordinates enthusiastically join him in turn. They never speak of this again.
One optional Quest in Divinity II: The Dragon Knight Saga has a group of people in rags approaching the PC, instantly switching into armor and weapons and striking such a pose. By the way the camera focuses on each one as their armor appears in a beam of light and they shout their names, you know it's a parody of this trope.
A song in Just Dance 3 is an affectionate parody of sentai theme songs, complete with all four members dancing pulling off stances!
In Pokémon X and Y, members of Team Flare occasionally strike such a pose when preparing to do battle.