Alright, took me longer than the day or two I initially planned on, but for the moves that your Pokemon can learn, Dragonite can learn all three of these through TM.
Meh, a day or two versus a week or two what's the difference?
For Blissey, she'll be able to learn Safeguard through TM. But she won't be able to learn Toxic or Teleport sadly.
This is tyranny! Tyranny I say! You can't just take my teleports behind you memes away like that! How will we ever strike fear into the hearts of our foes now without a teleporting pink fluff ball at our disposal? Wait a minute... Slowbro learns Teleport prior to generation eight along with his mountain of other Psychic moves... And, he learns Trick Room...
Alright, lads lock-in we're picking up a Slowbro so I can teach them Teleport, and Trick Room solely so that during the Indigo League I can have Slowbro use Trick Room to outspeed the opposing Pokemon and then use Teleport which has -6 Priority to appear behind them at which point Slowbro will be able to immediately attack them from behind because the turn will roll over, and he'll outspeed allowing him to successfully pull off this meme.
Being more serious for a second, Slowbro being able to learn Teleport among a variety of other useful moves whereas Lapras by comparison doesn't really see her move pool expand much even when digging into prior generations has at this point firmly solidified Slowbro as my choice for our seventh Pokemon. Same, role that Lapras would have fulfilled it's just a Slowbro does it better.
For Umbreon, as mentioned he'll be able to learn Work Up through a TM. However he won't be able to learn Heal Bell.
Fair enough, he does already learn Refresh. And thanks for looking into the moves from older generations for the team sheet.
For that, it's generally considered normal albeit uncommon to use it as a whetstone. It's only considered rude if you're over levelled to the point that you'd not get much out of fighting sub optimally.
[X] Dragonite - Keeping Dragonite in will allow him to learn how to properly fly and adapt to his new body. Although that could also be done via standard training.
A gym battle is no place to make your pokemon learn about type disadvantages. Win the badge and get practice elsewhere. Don't be rude.
As you can see it's normal and accepted to use gym battles as a whetstone plus that's how Violet has treated League-sanctioned or otherwise friendly battles throughout the entire quest, only really putting forward her full effort when she participates in unsanctioned battles or when pushed to her limits like in the Pokemon Tower. But I would agree that putting in Forretress is sandbagging too hard, and she wouldn't even gain much from it, especially in comparison to Magneton who could evolve from this battle.