Gastrodon

With its decent defensive typing, good mixed bulk, and access to Recover, Gastrodon is a good defensive Pokemon that can check some of RU's most prominent offensive threats such as Zygarde-10%, Mega Blastoise, Metagross, and Noivern. Gastrodon's Storm Drain ability also gives it even more defensive presence, allowing it to come in against Water-type moves like Scald and check offensive Water-types like Barbaracle. While Gastrodon's defensive typing leaves it with only one weakness, Grass is an omnipresent offensive type in RU, meaning Pokemon like Virizion, Roserade, and Shaymin can easily take it out. Its inability to deal with status conditions and vulnerability to all forms of entry hazards mean that Gastrodon can be easily overwhelmed. In fact, most of the Water-types Gastrodon would like to check like Milotic and Slowbro often carry Toxic to cripple it. Gastrodon is also rather passive, since it usually relies on Toxic for most of its damage output, meaning common wallbreakers like Machamp and Escavalier can easily threaten it out of battle. Its main competition comes from Slowbro, which is less passive, has a Fighting resistance, and has arguably a better defensive ability in Regenerator.