Eruption Primal-Groudon is great addition on offensive teams due immense damage an eruption of 150 Base Power can do.
It's useful to surprise lot of pokémon who would try to check Primal-Groudon, for example it 2HKO Giratina-O, OHKO defensive Yveltal, OHKO Arceus-Ground after few chip damage and good chance to OHKO Salamence after rocks.
"l’efficacité d'eruption est renforcé, dans son aspect de wallbreak, par le fait que ce set utilise Sword Dance pour passer Arceus-Water et Giratina deux des meilleurs switch-in à Eruption."
-Defogger is good partenire
-anything avec de la prio (= qui se débrouille bien face au teams offensive).
"Une Autre option niche est Stickey Web teams"

Because Eruption base power should be kept as much as possible, the users of defog

Eruption Primal-Groudon is great addition on offensive teams due immense damage an eruption of 150 Base Power can do.
It's useful to surprise lot of pokémon who would try to check Primal-Groudon, for example it 2HKO Giratina-O, OHKO defensive Yveltal, OHKO Arceus-Ground after few chip damage and good chance to OHKO Salamence after rocks.
the efficiency of Eruption is strengthened, in its wallbreak appearance, by the fact that this set uses Sword Dance to bypass Arceus-Water and Giratina two of the best switches-in to Eruption.
This set like have good hasard control to help wallbreaking effort, so Stealth Rock setters