Link?
That would be the dream.
Beldum with a good two bar steel charge move on Metagross
Aerodactyl with Rock Throw
Larvitar with Tyranitar either Rock Throw or a better Dark charge attack
Ghastly with Gengar Shadow Claw
Eevees with Jolteon Wildcharge, Vaporeon new Water Charge or Flareon with a new fire charge
Community Day Survey
Niantic is sending out surveys about Community Day and the final question asks who you think should star in a future C-Day.
Who are you going to nominate? I picked Ralts with Gardevoir getting a Fairy quick move
Answers
The Eeveelutions already have great movesets so I don't see much appeal in that. Espeon is the one that needs a good charge move the most, Futuresight is weaker as a move than Thunderbolt/Hydro Pump/Overheat.
RT Ttar would be neat but breaks Niantic's current moveset rules. Smack Down as a new fast move would be more likely. Same would be true for Aerodactyl but there are apparently event-exclusive RT Aerodactyls in the originals so maybe.
I would very much prefer something Unique to Pokémon Go rather than bringing in a Shiny from another Pokémon game.
For example: Fossil Pokémon are spawning at increased rates AND they're displaying colourage that we have never seen! Why is this happening? How many different colourage can you find for each? WHAT IS GOING ON?? And instead of it being a Shiny, have there be 4 different colour schemes for Kabuo, Aerodactyl and Omanyte. Then have the Research Projects be "Catch each colouration of (Pokémon)!" "Evolve each colour type to see what they evolve to!", etc.
It's ... nice... to get that Shiny and that unique move. But Niantic can do so much better.