For me, Ive always wanted just a regular dragon. Something between Charizard and Dragonite.
Lizard > dinosaur > dragon, all quadrupedal
Starts out as a regular lizard that you can find in the early game; nothing special. Becomes an actual dragon type at 25 but doesnt get a dragon move until 40, because its clear they dont want you to have dragons early.
Lizodon - normal
1 - growl, scratch
10 - defense curl
15 - tail slap
20 - bite
Dongodon - dragon
25 - scary face
30 - roar
35 - slam
40 - dragonbreath
45 - smokescreen
Dracodon - dragon/flying
50 - wing attack
52 - slash
55 - iron defense
60 - dragon claw
65 - outrage
90/120/100/100/80/65
HMs: cut, fly, strength, rock smash, rock climb
noteworthy TMs: fire fang, flame thrower, crunch, dig, dragon dance, dragon rage, iron tail, rock slide