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Potsluts and buffers through PMEX.
>MC & Pikachu with grid
frail pots with Endurance
>Skyla & Swanna
with grid and ex mogging Pikachu that is also a Striker
>Sabrina & Alakazam
with grid making her one of the most useful units for a while
>Leaf & Eevee
without grid it was pointless, with grid it became somewhere on same Skyla tier, slightly better Pots + Flinch but no useful immediate buffs, can't even assist the common Inertia users
>Sycamore & Xerneas
with grid replaced Leaf, is more specialized, cannot flinch but can often tank for the team and heal back while also buffing offenses, sync gives +6+6+6 on the special side and refills gauge, will eventually get EX
>Hop & Zamazenta
with grid, while not insane it has also replaced Leaf as potslut and physical buffer that also boosts crits and he is free like Sycamore, for long battles Shield Bash hits harder than Iron Tail and can also not consume gauge
>Misty & Psyduck
with grid are a new freebie 4* with immediate unlockable EX, potions, slow evasion build up and 1/1 TM with a fair enough MPR that can let you buff your team defenses to +6 in 3 turns, she is comparable to Leaf on long battles
>Easter 2021 Burgh & Togepi
with grid mogs Leaf & Eevee in many ways
>Sonia & Yamper, SC Lillie & Polteageist, Ingo & Excadrill, Palentine 2022 Bea, Red & Snorlax, Anniversary 2022 Skyla & Tornadus etc.
all these supports and trends are much better and specialized supports that heal and buff stats without wasting unnecessarily buffs on sync only
>tl;dr
Leaf & Eevee probably didn't even have time to shine or affect the meta because they got replaced and powercrept in every season and aspect, in terms of EX priority they are very low unless you are some eeveelution enthusiast