I'm pretty sure this fails, because even Arceus's Avatar, as we see from Legends: Arceus, is at least comparable to the Creation Trio, meaning it Speedblitzes him, too.
Also this plan has several flaws:
1. Team Galactic researched Poke Balls, & determined that even a Master Ball restrains/disallows a caught Creation Trio too much for it to use its full power. If you accept this as not PIS (Some oppose this, because it implies Creation Trio could be weakened if captured.), it brings up the problem that Rick would be basing his means of capturing a multiverse killer on technology that doesn't actually let it stay at multiverse killer level.
2. Even if the ball work, Poke Balls, IIRC, don't make Pokemon mindless servants; A caught Pokemon is totally able to rebel. & in PL:A, Arceus's Avatar is given to the player, by Arceus's choice, after completing its trials. So if I understand right, the player has to get True Form Arceus's approval -Catch all the Pokemon in Hisui, & battle the Creation Trio, IIRC?- to meet with the Avatar.
Are there are any pre-created Arceus Avatars? Does Rick have the means of accessing them?
3. Even if Rick finds one, he's finite speed, isn't he? Arceus Avatar Speedblitzes.
4. Looking at the profile, Arceus Avatar's Powers & Abilities provide several hurdles to actually capturing it (Besides speedblitzing Rick & probably most of his tech, too, since Arceus might be infinite & IDK where into FTL they are.):
Cosmic Awareness,
Nigh-Omniscience,
Enhanced Senses,
Extrasensory Perception,
Invulnerability and
Forcefield Creation (Protected by a constant shield that protects it from invasive abilities such as
Mind Attacks as well as ordinary attacks, can actively create them itself. Upscaled from Protect),
Invulnerability and
Forcefield Creation (Protected by a constant shield that protects it from invasive abilities such as
Mind Attacks as well as ordinary attacks, can actively create them itself. Upscaled from Protect),
Acausality (Types 1, 3 and possibly 4),
Precognition (Its Pokémon Conquest ability, Omnipotent, allows it to foresee and dodge incoming attacks),
Time Manipulation (Future Sight allows the user to observe and attack the target in the future, bypassing
Force fields and
Precognition in the process)
(For those who forget what Type 4 Causality means.)
Type 4: Irregular Causality: Characters with this type of Acausality operate on a different and irregular system of cause and effect than regular causality. This grants them resistance to abilities such as Causality Manipulation, Fate Manipulation, and Precognition, among others.
If Avatar Arceus's "possibility Type 4" means it has Type 4, then depending on the Causality system, the Cause of hitting it with a Poke Ball may not have the Effect of making it go inside. & Type 3 means there are other versions of Arceus, although, I'm unsure if this means other than True Form.
So yeah. I don't think Rick is catching an Arceus Avatar off-guard, even if he COULD make a Poke Ball good enough for that (Which abilities/feats are the basis for his?) AND there was no irregular Causality system hindering him, not the least of which because it might be just not present.
& even if he does find it, it could still just speedblitz/betray/hax him.
Like I said. Lock Grandpa up & throw away the key.
Here it’s clear that he can manipulate the past the be wants to,
