Available Lost Animon as of today.
So, I am not sure if everyone knows this but the AniWiki actually does tell you which Animon have their lost versions available if you tab the dex to the right most one that looks like a shuriken.
(Tabs look like: three lines next to two arrows pointing TO each other. three lines next to two arrows pointing AWAY from each other. Four point star or Shuriken.)
So, with that in mind I now present to you all the currently available LOST version of Animon in the game. Plus, a bonus of how to evolve them.
001 Mewaii -Lv18> 002 Maidelly -Lv40 + Meridemblem> 003 Megamitosa
\ 002 Maidelly -Lv40 +Septemblem> 004 Dolegamii
005 Vortail -Lv18> 006 Furtex -Lv40 + Meridemblem> 007 Weaphoon
\ 006 Furtex -Lv40 + Septemblem> 008 Fursazen
009 Ozelash -Lv18> 010 Kouzear -Lv40 + Meridemblem> 011 Byazevolt
\ 010 Kouzear -Lv40 + Septemblem> 012 Zenicore
013 Salabel -Lv18> 014 Vilender -Lv40 + Meridemblem> 015 Horrogre
\014 Vilender -Lv40 + Septemblem> 016 Goldrago
017 Queccha -Lv18> 018 Quequator -Lv40 + Meridemblem> 019 Barangu
\ 018 Quequator -Lv40 + Septemblem> 020 Meterier
021 Smellwing -Lv18> 022 Toxigall -Lv38> 023 Garbalisk
024 Deniuli -Lv28 + Morning> 025 Fulgaze
026 Almyuna -Lv28 + Night> 027 Lopyuna
028 Lampecko -Lv25 + Lampalite> 029 Luxecko
033 Mushwick -Lv20> 034 Owaxle -Lv30 + Candleshroom> 035 Nefandle
036 Melotica (Logos) -Lv24> 037 Meloquinia
036 Melotica (Mythos) -Lv24> 038 Doryogun
039 Rainxy -25 Trait use> 040 Rainagon
041 Mollupom -Lv26 with hodden Water type> 042 Obsidedge
043 Cocopa -32 Trait use> 044 Papaco
050 Nanafin
051 Pinchop -Lv30 + Nanafin in party> 052 Klawller (say goodbye to the Nanafin btw)
053 Sapsy -Lv28> 054 Dionybble
055 Canabble (Logos) -Lv25> 057 Birchette
055 Canabble (Mythos) -Lv25> 056 Foiequack
061 Cadedro -Lv27 + Rain> 062 Nelumbier
065 Mimiral -Lv27> 066 Trinkoral -Crimson Horn> 067 Encantyss
071 Veveso
081 Rushog (Logos) -Lv36 in Area 25> 083 Blizzbull
081 Rushog (Mythos) -Lv36 in Area 12 or Suvius Peak> 082 Volcabeko
084 Chompuff -Catch 20 Animon while in party> 085 Patround
089 Shakpak -Lv34> 090 Sphytter
093 Kinedge -Lv30 + Use Aftershock 10 time> Ferroll
095 Lanpit -Use Trait 20 times> 096 Alpaguet
102 Muribang
105 Ogiemask -Use trait 20 times> 106 Babalure