I don't know where you see Jolteon is fine, Jolteon is now a hated pokemon because it doesn't have strong moves, nobody wants a Jolteon nowadays, comparing Jolteon to Raichu, Jolteon loses a lot.
i was just taking a look on jolteon and raichu as u said, really, jolteon lost in demage, cds, stun, and even in TM learnset
just making a small comparison
since volt tackle is similar to wild charge and also give a mini stun raichu has 25s and jolt 30
jolteon's stun is bite , 15 s that's ok but raichu has growl with 25s, then a better stun
even jolteon's thunder is slower than raichu
jolteon has 9 moves, one of them is a linear move, powerfull but linear, easy to miss and avoid and raichu has 10 moves + a buff passive, one of them is double team that can make raichu stay alive for + time (if oponent target the clone instead of the real one) and buff even more ur power
for me both pokemon should be good in a diferent way i understand the fact of jolt could be better against psy pokemons with pin misille and bite, but raichu may be even better than jolt against those types even without a super effective skill
looking in this way wouldn't be so crazy think about add double team in jolt with same cd as raichu, you could say"it has bite with 15 s" well 2s stun and this move is the fastest move of jolteon, raichu already have electroball, iron tail, thunder bolt and thundershock with 15 s cd or less(don't forget about buff passive)
in this way i would like to suggest:
5 seconds less cd in thunder and thunder fang, in this way it will be 30s and 15 s
add double team lv 55 50 seconds cd
maybe agility passive buti think it is not necessary at all ( but would be fair)
in this way u won't make an op pokemon, and u will start see + ppl using jolteon in duel, actually buzz is used for xp and jolteon and raichu are like "x1" poke, but raichu has a great advantage in this position
i would like to know what u all guys think about it
Regards
Nan