Hi all! Don't gonna say you guys "screencap this" "you will see that what I say here will be the real thing" stuff. I'm only posting here what I know (information, not opinion). I'm almost sure you guys won't be deceived. Sorry for my English, but i'm not native speaker.

-First, pokedex info. There are 99 new pokemon (3 mythicals):

#810 Grookey(grass)
#811 Grookey evo (grass)
#812 Grookey final evo (grass/steel)
#813 Scorbunny (fire)
#814 Scorbunny evo (fire)
#815 Scorbunny final evo (fire/fairy)
#816 Sooble (water)
#817 Sooble (water)
#818 Sooble final evo (water/poison, not dragon).
#819 Little capybara (normal)
#820 Big capybara (normal/grass)
#821 Bird tiny stork-like (normal/flying)
#822 Stork evo (water/flying)
#823 Stork final evo (water flying)
#824 Moth larvae (bug)
#825 Moth caterpillar (bug)
#826 Big moth 1 (alt evo 1) (bug/psychic)
#827 Big moth 2 (alt evo 2) (bug/dark)
#828 Grasshoper (bug)
#829 Grasshoper evo - digger grasshopper (bug/ground)
#830 young wild boar (ground/normal)
#831 boar evo (big wild boar) - (ground/fighting)
#832 little pinscher dog (electric)
#833 pinscher evo - doberman (electric/dark)
#834 goldfish (water)
#835 goldfish evo (water/psychic)
#836 porcelain doll based pokemon (fairy)
#837 tuber based pokemon (grass/ground)
#838 kangaroo (fighting)
#839 rush root (grass)
#840 rush root evo (grass/water)
#841 ant larve (bug)
#842 ant evo (bug/fighting)
#843 peanut lanternfly (bug/flying) (this is the one you saw in the video)
#844 peanut lanternfly evo (bug/dragon)
#845 badger (dark)
#846 badger evo (dark/ground)
#847 menhir stone (rock)
#848 menhir stone evo (rock/psychic)
#849 ghost clock (ghost)
#850 ghost clock evo (ghost)
#851 manatee (water)
#852 manatee evo (water)
#853 fencer (fighting)
#854 fencer evo (fighting/steel)