Currently in the updating process please post if you want to add anything!
(Thank you Misaki Chi and Servant for the introduction, thankyou to the Master 42 and various others for fixing up the format!)
Getting Started
To begin with, find the maximum Speed of the Pokemon you're building. You can find this information on our analysis pages for each Pokemon. After you've found your maximum Speed, use the following tables to see how much Speed the threats you wish to out speed have, and EV your Pokemon accordingly. Keep in mind that when calculating your maximum Speed stat, you need to take into account your Pokemon's Speed IV.
For example, +Speed natured Pinsir can hit a maximum Speed of 295. The closest threat in it's Speed tier sit on 291 Speed (being a positive natured Magmortar). You can therefore safely run 292 Speed, which requires 240 EVs as opposed to 252, and still allows Pinsir to outrun all necessary threats in the speed tiers.
Speed Boosts
To calculate your necessary starting Speed when factoring in Agility, Rock Polish, Chlorophyll or Swift Swim, all you need to do is add one to the Speed of the Pokemon you wish to outspeed, divide it by two and round up the result. In practice, for example, should you decide that you want your Blaziken to outspeed +Speed Sceptile after a single agility to destroy it with Fire Blast, you just add one to Crobat's Speed, giving you 395. Dividing this in half and rounding up the result when the necessary gives you your desired starting Speed which is 198 in this case, which Blakizen easily reaches.
To factor in the use of Dragon Dance, Salac Berry, or Choice Scarf you need to find the Speed of the target you wish to outspeed and multiply it by 2/3. For example, if you want your Blaziken to outspeed +Speed Crobat, all you need to do is multiply your target Speed (394) by 2/3, which returns 264. With a Choice Scarf Blaziken should now hit 417 but in order to outspeed Electrode you would want at least 395, so add a single point to the 264, this is now the minimum starting Speed necessary in this case.
Tier 0 (+1 Users, base Speed > 90)
658 - +2 252 Floatzel (115)
518 - +2 252 Blaziken, Kabutops (80)
492 - +1 +nature/252 Charizard (100)
478 - +2 252 Ludicolo (70)
478 - +1 252 Espeon (110)
459 - +1 +nature/252 Roserade (90)
448 - +1 252 Charizard, Staraptor, Typhlosion (100)
433 - +1 252 Houndoom (95)
430 - +2 252 Rampardos (58)
426 - +1 +nature/252 Medicham, Venusaur (80)
422 - +2 252 Torterra (56)
421 - +1 252 Rotom (91)
418 - +2 252 Exeggutor (55)
418 - +1 252 Moltres, Roserade (90)
Tier 1 (100 < base Speed < 140)
416 - +nature/252 Electrode (140)
409 - +1 +nature/252 Absol, Smeargle (75)
403 - +1 252 Pinsir (85)
398 - +2 252 Tangrowth (50)
397 - +1 252 Magmortar (83)
394 - +nature/252 Crobat (130)
388 - +1 252 Blaziken, Gallade, Medicham (80)
383 - +nature/252 Swellow (125)
382 - +1 252 Feraligatr (78)
376 - +1 +nature/252 Glaceon (65)
372 - +nature/252 Sceptile (120)
361 - +nature/252 Ambipom, Floatzel, Raikou (115)
360 - +1 +nature/252 Abomasnow (60)
354 - +1 +nature/252 Rampardos (58)
352 - +2 no-speed Ludicolo (70)
350 - +nature/252 Espeon, Froslass, Tauros (110)
343 - +1 +nature/252 Ursaring (55)
343 - +1 252 Glaceon (65)
339 - +nature/252 Mismagius (105)
329 - 252 Ambipom, Floatzel (115)
328 - +nature/252 Charizard, Ninetales, Shaymin, Staraptor, Typhlosion (100)
Tier 2 (70 < base Speed < 100)
322 - +1 252 Rampardos (58)
319 - 252 Tauros (110)
317 - +nature/252 Arcanine, Drapion, Houndoom (95)
309 - +nature/252 Rotom (91)
306 - +nature/252 Moltres, Roserade (90)
299 - 252 Charizard, Shaymin, Staraptor (100)
295 - +nature/252 Pinsir, Toxicroak (85)
291 - +nature/252 Magmortar (83)
289 - 252 Arcanine (95)
284 - +nature/252 Blaziken, Gallade, Gardevoir, Medicham (80)
280 - +nature/252 Feraligatr (78)
279 - 252 Moltres (90)
273 - +nature/252 Smeargle (75)
269 - 252 Pinsir, Toxicroak (85)
265 - +nature/252 Honchkrow (71)
265 - 252 Magmortar (83)
251 - +nature/252 Glaceon (65)
249 - 252 Absol (75)
241 - 252 Honchkrow (71)
240 - +nature/252 Abomasnow (60)
239 - 252 Ludicolo (70)
Tier 3 (< 70 base Speed)
236 - no-speed Miltank, Shaymin (100)
236 - +nature/252 Rampardos (58)
229 - +nature/252 Ursaring (55)
226 - no-speed Drapion, Uxie (95)
218 - +nature/252 Tangrowth (50)
218 - no-speed Rotom (91)
215 - 252 Rampardos (58)
211 - 252 Torterra (56)
209 - 252 Exeggutor, Ursaring (55)
207 - +nature/252 Marowak (45)
206 - no-speed Toxicroak (85)
199 - 252 Tangrowth (50)
198 - no-speed Milotic (81)
196 - no-speed Gardevoir, Meganiuim, Mesprit, Venusaur (80)
192 - no-speed Blastoise (78)
189 - 252 Marowak (45)
188 - no-speed Nidoqueen (76)
186 - no-speed Claydol (75)
176 - no-speed Hitmontop, Ludicolo (70)
170 - no-speed Lanturn (67)
166 - no-speed Glaceon, Umbreon, Walrein (65)
156 - no-speed Clefable, Porygon 2 (60)
146 - no-speed Exeggutor, Ursaring (55)
140 - -nature/31IV Abomasnow (60)
136 - no-speed Azumarill, Chansey, Hariyama, Regice, Regirock, Registeel, Tangrowth (50)
121 - -nature/0IV Umbreon (65)
106 - no-speed Spiritomb (35)
96 - no-speed Slowbro, Steelix (30)
58- -nature/0IV Slowbro, Steelix (30)
(Thank you Misaki Chi and Servant for the introduction, thankyou to the Master 42 and various others for fixing up the format!)
Getting Started
To begin with, find the maximum Speed of the Pokemon you're building. You can find this information on our analysis pages for each Pokemon. After you've found your maximum Speed, use the following tables to see how much Speed the threats you wish to out speed have, and EV your Pokemon accordingly. Keep in mind that when calculating your maximum Speed stat, you need to take into account your Pokemon's Speed IV.
For example, +Speed natured Pinsir can hit a maximum Speed of 295. The closest threat in it's Speed tier sit on 291 Speed (being a positive natured Magmortar). You can therefore safely run 292 Speed, which requires 240 EVs as opposed to 252, and still allows Pinsir to outrun all necessary threats in the speed tiers.
Speed Boosts
To calculate your necessary starting Speed when factoring in Agility, Rock Polish, Chlorophyll or Swift Swim, all you need to do is add one to the Speed of the Pokemon you wish to outspeed, divide it by two and round up the result. In practice, for example, should you decide that you want your Blaziken to outspeed +Speed Sceptile after a single agility to destroy it with Fire Blast, you just add one to Crobat's Speed, giving you 395. Dividing this in half and rounding up the result when the necessary gives you your desired starting Speed which is 198 in this case, which Blakizen easily reaches.
To factor in the use of Dragon Dance, Salac Berry, or Choice Scarf you need to find the Speed of the target you wish to outspeed and multiply it by 2/3. For example, if you want your Blaziken to outspeed +Speed Crobat, all you need to do is multiply your target Speed (394) by 2/3, which returns 264. With a Choice Scarf Blaziken should now hit 417 but in order to outspeed Electrode you would want at least 395, so add a single point to the 264, this is now the minimum starting Speed necessary in this case.
Tier 0 (+1 Users, base Speed > 90)
658 - +2 252 Floatzel (115)
518 - +2 252 Blaziken, Kabutops (80)
492 - +1 +nature/252 Charizard (100)
478 - +2 252 Ludicolo (70)
478 - +1 252 Espeon (110)
459 - +1 +nature/252 Roserade (90)
448 - +1 252 Charizard, Staraptor, Typhlosion (100)
433 - +1 252 Houndoom (95)
430 - +2 252 Rampardos (58)
426 - +1 +nature/252 Medicham, Venusaur (80)
422 - +2 252 Torterra (56)
421 - +1 252 Rotom (91)
418 - +2 252 Exeggutor (55)
418 - +1 252 Moltres, Roserade (90)
Tier 1 (100 < base Speed < 140)
416 - +nature/252 Electrode (140)
409 - +1 +nature/252 Absol, Smeargle (75)
403 - +1 252 Pinsir (85)
398 - +2 252 Tangrowth (50)
397 - +1 252 Magmortar (83)
394 - +nature/252 Crobat (130)
388 - +1 252 Blaziken, Gallade, Medicham (80)
383 - +nature/252 Swellow (125)
382 - +1 252 Feraligatr (78)
376 - +1 +nature/252 Glaceon (65)
372 - +nature/252 Sceptile (120)
361 - +nature/252 Ambipom, Floatzel, Raikou (115)
360 - +1 +nature/252 Abomasnow (60)
354 - +1 +nature/252 Rampardos (58)
352 - +2 no-speed Ludicolo (70)
350 - +nature/252 Espeon, Froslass, Tauros (110)
343 - +1 +nature/252 Ursaring (55)
343 - +1 252 Glaceon (65)
339 - +nature/252 Mismagius (105)
329 - 252 Ambipom, Floatzel (115)
328 - +nature/252 Charizard, Ninetales, Shaymin, Staraptor, Typhlosion (100)
Tier 2 (70 < base Speed < 100)
322 - +1 252 Rampardos (58)
319 - 252 Tauros (110)
317 - +nature/252 Arcanine, Drapion, Houndoom (95)
309 - +nature/252 Rotom (91)
306 - +nature/252 Moltres, Roserade (90)
299 - 252 Charizard, Shaymin, Staraptor (100)
295 - +nature/252 Pinsir, Toxicroak (85)
291 - +nature/252 Magmortar (83)
289 - 252 Arcanine (95)
284 - +nature/252 Blaziken, Gallade, Gardevoir, Medicham (80)
280 - +nature/252 Feraligatr (78)
279 - 252 Moltres (90)
273 - +nature/252 Smeargle (75)
269 - 252 Pinsir, Toxicroak (85)
265 - +nature/252 Honchkrow (71)
265 - 252 Magmortar (83)
259 - 252 Blaziken, Gallade, Gardevoir, Kabutops, Medicham (80)
255 - 252 Feraligatr (78)251 - +nature/252 Glaceon (65)
249 - 252 Absol (75)
241 - 252 Honchkrow (71)
240 - +nature/252 Abomasnow (60)
239 - 252 Ludicolo (70)
Tier 3 (< 70 base Speed)
236 - no-speed Miltank, Shaymin (100)
236 - +nature/252 Rampardos (58)
229 - +nature/252 Ursaring (55)
226 - no-speed Drapion, Uxie (95)
218 - +nature/252 Tangrowth (50)
218 - no-speed Rotom (91)
215 - 252 Rampardos (58)
211 - 252 Torterra (56)
209 - 252 Exeggutor, Ursaring (55)
207 - +nature/252 Marowak (45)
206 - no-speed Toxicroak (85)
199 - 252 Tangrowth (50)
198 - no-speed Milotic (81)
196 - no-speed Gardevoir, Meganiuim, Mesprit, Venusaur (80)
192 - no-speed Blastoise (78)
189 - 252 Marowak (45)
188 - no-speed Nidoqueen (76)
186 - no-speed Claydol (75)
176 - no-speed Hitmontop, Ludicolo (70)
170 - no-speed Lanturn (67)
166 - no-speed Glaceon, Umbreon, Walrein (65)
156 - no-speed Clefable, Porygon 2 (60)
146 - no-speed Exeggutor, Ursaring (55)
140 - -nature/31IV Abomasnow (60)
136 - no-speed Azumarill, Chansey, Hariyama, Regice, Regirock, Registeel, Tangrowth (50)
121 - -nature/0IV Umbreon (65)
106 - no-speed Spiritomb (35)
96 - no-speed Slowbro, Steelix (30)
58- -nature/0IV Slowbro, Steelix (30)