Depending on how one wants to use Raticate's Guts-boosted power, with this set, Raticate can be played in two ways: as either a scout or a late-game sweeper. If played as a scout, Raticate should come in during early-game on something it forces out, such as Chansey, and activate its ability. When the opponent reveals their Raticate counter, Raticate should use U-turn to switch to the appropriate teammate and keep momentum on your side of the battle. Facade is the STAB move of choice because after the Flame or Toxic Orb has been activated, its Base Power reaches 210 (with STAB factored in). To demonstrate Facade's power, Raticate is able to 2HKO Milotic and OHKO Chansey after Stealth Rock with a Guts boost under its belt. Sucker Punch is the recommended choice for the second slot as it allows Raticate to deal good damage to Pokemon that are faster than it, such as Sceptile, Alakazam, and Mismagius. Crunch can be used in place of Sucker Punch since it is Raticate's strongest and most reliable move against Rotom and Spiritomb.
If using Raticate as a late-game sweeper, Reversal can be used in U-turn's spot to hit Rhyperior and Registeel for super effective damage once Raticate's health has been diminished sufficiently through poison or burn damage. Finally, Swords Dance can be used in the last slot over Protect to provide Raticate with the power to OHKO the majority of the UU metagame that doesn't resist Facade. However, Protect is the recommended choice to allow Raticate to safely activate its Orb of choice and scout the opponent's next move.
The choice between Toxic Orb and Flame Orb is rather arbitrary in Raticate's case. Flame Orb is more appealing if you plan on keeping Raticate on the battlefield for an extended period of time; Toxic Orb is the more attractive option if you plan on keeping Raticate in for less than three turns, as after that, the damage from Toxic Orb will outweigh the damage from Flame Orb. Thanks to Raticate's ability, Guts, it is not affected by the Attack drop normally induced by the burn from its Flame Orb, so either option is a safe bet.
Jolly is the required nature as it allows Raticate to outspeed base 95s and below such as Houndoom and Rotom. Pursuit can be used in place of Crunch or Sucker Punch, but odds are that most Pokemon will not be immediately threatened by Raticate and won't switch out, so the reliability of the other moves is preferred. Grass Knot can be used to 2HKO Omastar, Kabutops, and Rhyperior, but other than that, offers little coverage and damage output. Super Fang can be used in the last slot to strip Registeel, Weezing, Rhyperior, and Regirock switch-ins of half their health, but then Raticate is forced to simply U-turn out afterward.
Raticate is utterly walled by Rock- and Steel-types, so providing it with good teammates to eliminate them is recommended. Dugtrio and Hitmontop are prime examples of such teammates; Dugtrio is able to trap its victims, such as Registeel, and cleanly dispose of them with Earthquake, while Hitmontop can buffer any physical attacks with Intimidate and proceed to unleash STAB Close Combats on the opposing Pokemon. Raticate is also stopped cold by physically defensive Weezing. Claydol is an excellent teammate to scare out Weezing with STAB Psychic, while also providing Stealth Rock or Rapid Spin support. Ghost-types such as Mismagius and Spiritomb are valuable teammates as they are immune to Fighting-type attacks that Raticate will likely encounter. Finally, Registeel makes a great partner as it can switch into a multitude of faster threats, such as Sceptile, Swellow, Scyther, Manectric, and Mismagius, and paralyze them with Thunder Wave. Registeel can also provide useful Stealth Rock support.