Rotom-Frost is really cool actually
Rotom-Frost
Ice/Electric
HP: 50
Atk: 65
Def: 107
SpC: 107 (over 105)
Spe: 86
Blizzard
Thunderbolt
Thunder Wave
Mimic / Rest / Confuse Ray / Reflect
Rotom-Frost's movepool is really small, however, he gets exactly what he needs. What makes the refrigerator so cool is that not only does he get STAB BoltBeam, but he is also the only thing that resists BoltBeam in a Retrofitted Meta. His HP and Attack are pitiful, but his Defenses and Special are decently high. His modest Special is boosted when you consider STAB on BoltBeam, which will most likely score a Super Effective hit. Ice-typing is good in RBY due to lack of good Fighting-types and Fire-types, while Electric is a good typing as well. However, he looses Levitate, making him weak to EarthSlide (that's what I'm calling it at least). Last move is filler, I pretty much just slapped on every move that is slightly viable.
Also, Thundurus-T is pretty cool
Thundurus-T
Electric/Flying
HP: 79
Atk: 105
Def: 70
SpC: 145 (over 80)
Spe: 101
Thunderbolt
Psychic
Hyper Beam / Agility
Thunder Wave
His Special is really good, and unlike Chandelure, he has the speed to abuse it. He competes with Zapdos for a spot, but Thundurus-T has some advantages over out spikey friend. He's outspeeds all of the base 100's by 1 point. He also has a higher attack stat, although he has no physical STAB to abuse like Zapdos. He does have Psychic though, which is a decent enough coverage move, as it allows you to hit common Electric resists such as Rhyperior. Hyper Beam is to hit weaken things with lower defenses. Agility can be used if 101 isn't fast enough for you, but outspeeding base 100s is probably good enough. It should be noted that because of how Paralysis works in Gen 1, Agility would allow you to keep your key 101 speed even if you're paralyzed. This is because if you use agility while you're paralyzed, unless you're hit with a speed reducing move (aka String Shot), Agility will essentially put you at neutral speed. What is really cool though, is his access to Thunder Wave. This is extremely good when you factor in that he will always outspeed base 100s and slower, so he will get the jump on them, allowing him to support his team, allowing a sweep for slower pokemon, such as Rayquaza or, more realistically, something like Rotom-Anything!