did a writeup a few months back of all the notable legalizations of moves that can be obtained on regular mons. feel free to point out corrections, this was pretty sloppily put together.
Notable legalizations:
Clefable gets Softboiled, Earthquake, Surf, Swords Dance, Sleep Powder, Amnesia, Transform, and Clamp, making it extremely diverse and capable of performing a ton of roles. Illegal with these is Acid Armor
Fearow picks up some interesting moves, including Wrap, Body Slam, Selfdestruct, Surf, Ice Beam, Rock Slide, Bone Club (illegal with Drill Peck), Counter, Hi Jump Kick, and Thunderbolt. Illegal with these moves it picks up Swords Dance, Explosion, Wrap, Mega Drain, and Bone Club, Thunder Wave, Body Slam though Bone Club and Body Slam Thunderwave are illegal with Drill Peck. Certainly sets itself apart from Dodrio now, though it’s still not quite viable.
Vileplume gets Thunderbolt and Explosion, which turns it into a mini Exeggutor. It also gets Psychic. However, these moves are sadly illegal with sleep powder.
Kangaskhan gets Swords Dance making it a potent late game sweeper. It also gets Amnesia, Sleep Powder, Thunder Wave, Softboiled, and Transform, making it a diverse lead. Illegal with these is Acid Armor.
Nidoking gets Swords Dance, Sleep Powder, Recover, Wrap, and Pin Missile. Much more viable, now a potent threat capable of decently fast sleep, sweeping, tanking hits, or spamming wrap along with its already stellar movepool. Swords Dance, Recover, Sleep Powder, and Softboiled Pin Missile, and Wrap are also legal with Transform, Clamp, and Amnesia. Finally, Explosion is legal with Swords Dance, Sleep Powder, and Pin Missile. Nidoking’s power to sleep opposing leads and immediately threaten with SD, Amnesia, or its stellar movepool.
Charizard gets Transform, Explosion, Wrap, and Softboiled. SD/Fire Blast/Earthquake/Explosion becomes a very real threat. It also gets Sleep Powder but that’s illegal with Explosion or Softboiled.
Marowak gains Sleep Powder, Transform, Amnesia, Softboiled, Clamp, and Thunder Wave, in addition to some special moves.
Arcanine gains Sleep Powder, Swords Dance, Transform, Amnesia, Clamp, Thunder Wave, Aurora Beam, Softboiled, Thunderbolt, Mega Drain, and Surf, allowing it to function as a sleeper lead, Amnesia sweeper, or both. Legal with Swords Dance and Clamp, it gets Earthquake, Explosion, Hypnosis, and Mirror Move. Swords Dance + Softboiled + EQ + Surf is also legal. Extremely diverse.
Golem gets Swords Dance, Leech Seed, and Hi Jump Kick. None of these are extremely useful but they could certainly see use. It also gets Glare and Sing though these are illegal with Leech Seed and Hi Jump Kick. It gets Spore, which is legal with Leech Seed and Swords Dance.
Slowbro gains Thunderbolt, Sleep Powder, Mega Drain, Swords Dance, Transform, Softboiled, and Counter. These are all usable with Amnesia as well though some aren’t with Withdraw.
Rhydon gets Thunder Wave, Sleep Powder, Transform, and Softboiled; all of these making great fillers.
Hypno gets Thunderbolt and Leech Seed. And Swords Dance/Body Slam. Leech Seed and Hypnosis are illegal.
Nidoqueen gets Acid Armor, Thunder Wave, Psychic, and Hi Jump Kick.
Mr. Mime gets Sleep Powder and Ice Punch.
Blastoise gets Swords Dance.
Magneton gets Ice Beam, Sing, and Body Slam.
Machamp gets Amnesia, Sleep Powder, Jump Kick, and Wrap, with Thunderbolt, Ice Beam, Blizzard, Fire Blast, and Fire Spin to abuse with Amnesia. Illegal with Amnesia is Pin Missile.
Golduck keeps its access to Amnesia and gets Sleep Powder, Fire Punch, Pin Missile, Double Kick, Bone Club, Fire Spin, and Fire Blast.
Exeggutor gets Ice Beam.
in addition to this, i have found the following glitchmons that are viable. not all of them are from R/B though, but thought i might post them in case anyone is curious.
http://bulbapedia.bulbagarden.net/wiki/ゥゥ)
tauros clone that gains access to sing, swords dance, and glare. r/b.
http://bulbapedia.bulbagarden.net/wiki/ゥ_.4
like an inverse chansey but not as good. 179/96/209/21/96 stats, which sound pretty great on paper but it has a really shit movepool. gets karate chop for crits, but it's null type so no stab. hyper beam, explosion, are alternatives. it also gets thunder wave, surf for rocks. that's like it though.
http://bulbapedia.bulbagarden.net/wiki/ゥ_4-_4
articuno clone that gains access to earthquake, hi jump kick, sleep powder, petal dance, withdraw, explosion, screech, a few others. yellow, which sucks because this is cool as fuck.
http://bulbapedia.bulbagarden.net/wiki//PkMn_▼PkMn
dodrio clone that loses drill peck but gains access to double kick, fire blast, flamethrower, thunderpunch, amnesia, thunder, and hypnosis. mini-tauros? r/b
http://bulbapedia.bulbagarden.net/wiki/F_q_,
pidgeot clone that forfeits mirror move but gains access to pin missile, barrier, ice punch, swords dance, and spore. yellow.
http://bulbapedia.bulbagarden.net/wiki/ゥ$_6ゥ
jolteon clone that no longer has double kick, pin missile, or agility but now has hydro pump, haze, transform, bone club, sludge, and swords dance. r/b
http://bulbapedia.bulbagarden.net/wiki/Glitch_(E4)
bugmon with 14/0/12/254/121 stats. gives it a pretty reasonable amount of special bulk, and while its physical bulk is ass it can switch into some niche things, like nonstabbed body slams and earthquakes. gets access to surf, fire punch, thunderbolt, and blizzard to abuse with its extremely high special. though it seems like a joke it gets wrap along with an extremely high speed, and it's not going to do much damage but it lets it pivot. also gets mega drain, softboiled, and conversion which could all be useful to varying degrees. r/b
http://bulbapedia.bulbagarden.net/wiki/'v
crashes the game upon being viewed but assuming we have some sort of workaround, here we go. this thing has garbo stats. 58/80/47/82/42, not hard hitting or bulky or fast. typeless. but gets amnesia, transform, sleep powder, softboiled, aurora beam, clamp, surf, thunderbolt, counter, and twave. though it evolves into marowak, nidoking, slowbro, kangaskhan, clefable, or arcanine and those are probably more useful with those moves. r/b.
http://bulbapedia.bulbagarden.net/wiki/7PkMn_'v
tentacruel clone (still gets wrap!) with access to hi jump kick, razor leaf, and explosion.
_______
in addition to all this, figured i would re-evaluate everything (taking into account counterparts). here are the results, with more info.
TRADEBACKS
Takes into account the properties of glitchmons traded between games.
M(FF) is a Charizard clone which loses Slash but gains Leech Seed and Aurora Beam. However, since M in R/B can be obtained from Q in Yellow, M also gains access to Wrap , Ice Beam, Blizzard, Thunder Wave, Thunderbolt, Psychic, and Bubblebeam. Since Q evolves from 4 4 Hy, M can also obtain Softboiled, Hi Jump Kick, and Surf.
Since LM4 evolves into Clefable or Nidoking, they gain access to Sleep Powder, Hydro Pump, Pin Missile, Surf, Psychic, Earthquake, Recover, Swords Dance, and Wrap. However, LM4 becomes 7G in Yellow, meaning these pokemon have access to Thunder Wave as well. 7G evolves into Marowak and a Charizard hybrid, meaning these Mons have access to the aforementioned moves in addition to Ice Beam, Thunderbolt, and some other more niche moves.
Triangle 8 evolves into Charizard, giving it access to Pin Missile, Wrap, Softboiled, Transform, Barrier, Flamethrower, and Explosion. In Yellow, this mon turns into g J 1, meaning that Charizard gains access to Thunderbolt, Ice Beam, Blizzard, Bubblebeam, Body Slam, and Agility.
4 katakanas evolves into Nidoking in Yellow, giving it access to Swords Dance, Pin Missile, Sleep Powder, Waterfall, Hydro Pump, Bind, and Recover. Since 4 katakanas changes to OPkMn4x in R/B, it means that Nidoking also gains access to Mega Drain and Wrap. OPk evolves into Fearow, meaning that Fearow gains these moves along with Ice Beam, Fire Punch, Bone Club, Psybeam, Thunderpuch, Surf, Earthquake, Seismic Toss, and Body Slam.
M N g evolves into Arcanine in R/B, giving Arcanine access to Swords Dance, Submission, Hypnosis, Earthquake, Clamp, Mirror Move, Rock Slide, and Explosion. When traded to Yellow, M N g becomes F q, giving Arcanine access to its moves, particularly Pin Missile, Spore, Barrier, and Ice Punch.
D4 in Yellow has access to Amnesia, Pin Missile, Jump Kick, Sleep Powder, Fire Spin, Fire Blast, Ice Beam, Blizzard, Thunderbolt, Earthquake, Psychic, Rock Slide, and Surf. It can pass these moves to Golduck and Machamp. However, D4 also becomes A G in R/B, meaning it can also transfer Hi Jump Kick, Spore, Night Shade, Super Fang, Seismic Toss, Recover, Drill Peck, Mega Drain, Explosion, and Slash to Golduck and Machamp.
8 P evolves into Fearow in Yellow, giving it the moves Bubblebeam, Ice Beam, Mega Drain, Thunderbolt, Psychic, Softboiled, and Thunder Wave to work with. It can be traded to R/B to become /PkMn triangle PkMn, giving it the moves Body Slam, Amnesia, Hypnosis, Mirror Move, Double Kick, and Flamethrower.
‘v in R/B evolves into Nidoking, Marowak, and Slowbro, in addition to M which evolves into Clefable and Kangaskhan. The Yellow equivalent – ‘r’r’4 – evolves into Arcanine. This means that all of these pokemon – Nidoking, Slowbro, Clefable, Kangaskhan, and Arcanine – have access to the following moves: Swords Dance, Submission, Earthquake, Counter, Psychic, Softboiled, Surf, Amnesia, Sleep Powder, Transform, Aurora Beam, Clamp, Mega Drain, Thunderbolt, Thunder Wave, and Rock Slide. Since Clefable and Kangaskhan must first evolve from M, they gain Seismic Toss.
I need some time on some of the more complex lines to really figure them out but this is a good start.