Spreadsheet of Speed Tiers
https://docs.google.com/spreadsheets/d/1CDSIS4e8b4MXUjHBEJEIfNnmg_F-jVnZf_RmcoOIzQk/edit?usp=sharing
Updated speed tier for 70 Happiness (ignore Mewtwo of course)
Tier 0 (Fastest to >+Spe Base 109)
290 Dodrio / 110 / +Spe / +2
256 Arcanine / 95 / +Spe / +2
246 Venomoth / 90 / +Spe / +2
234 Arcanine / 95 / Neutral / +2
204 Dragonite / 80 / Neutral / +2
200 Cloyster / 70 / +Spe / +2
190 Aerodactyl-Mega, Alakazam-Mega / 150 / +Spe / 0
184 Venomoth / 90 / +Spe / +1
179 Mewtwo-Mega-Y / 140 / +Spe / 0
173 Alakazam-Mega / 150 / Neutral / 0
168 Aerodactyl, Gengar-Mega, Mewtwo(+Mega-X) / 130 / +Spe / 0
166 Omastar / 55 / +Spe / +2
157 Alakazam, Pikachu-Starter / 120 / +Spe / 0
152 Omastar / 55 / Neutral / +2
150 Persian-Alola, Starmie / 115 / +Spe / 0
145 Dodrio, Gengar, Dugtrio-Alola, Raichu-Alola, Tauros / 110 / +Spe / 0
Tier 1 (+Spe Base 109 to >+Spe Base 76)
143 Ninetales-Alola / 109 / +Spe / 0
142 Alakazam, Pikachu-Starter / 120 / Neutral / 0
139 Rapidash / 105 / +Spe / 0
134 Charizard-Mega-X, Charizard-Mega-Y, Mew, Ninetales, Zapdos / 100 / +Spe / 0
128 Arcanine / 95 / +Spe / 0
123 Moltres, Venomoth / 90 / +Spe / 0
122 Mew / 100 / Neutral / 0
119 Hitmonlee / 87 / +Spe / 0
117 Articuno, Nidoking / 85 / +Spe / 0
117 Arcanine / 95 / Neutral / 0
113 Gyarados, Gyarados-Mega / 81 / +Spe / 0
112 Dragonite, Kabutops, Venusaur-Mega / 80 / +Spe / 0
109 Blastoise-Mega / 78 / +Spe / 0
108 Raticate-Alola / 77 / +Spe / 0
Tier 2 (+Spe Base 76 to >-Spe Base 78)
107 Nidoqueen / 76 / +Spe / 0
106 Eevee-Starter / 75 / +Spe / 0
103 Gyarados, Gyarados-Mega / 81 / Neutral / 0
102 Dragonite, Venusaur-Mega / 80 / Neutral / 0
100 Cloyster, Poliwrath / 70 / +Spe / 0
99 Blastoise-Mega / 78 / Neutral / 0
97 Nidoqueen / 76 / Neutral / 0
96 Eevee-Starter / 75 / Neutral / 0
94 Sandslash, Sandslash-Alola / 65 / +Spe / 0
91 Poliwrath / 70 / Neutral / 0
Tier 3 (-Spe Base 78 to everything slower)
89 Blastoise-Mega / 78 / -Spe / 0
86 Sandslash, Sandslash-Alola / 65 / Neutral / 0
83 Machamp, Omastar / 55 / +Spe / 0
81 Clefable / 60 / Neutral / 0
76 Machamp, Omastar / 55 / Neutral / 0
71 Chansey, Muk-Alola / 50 / Neutral / 0
66 Exeggutor-Alola, Golem / 45 / Neutral / 0
64 Muk-Alola / 50 / -Spe / 0
61 Rhydon / 40 / Neutral / 0
55 Melmetal / 34 / Neutral / 0
51 Slowbro-Mega / 30 / Neutral / 0