Hi I beat the Raikou Guardian 3x in a row and didnt get an offer for the dog? I instead got the dialogue to pick one of the listed drops after winning 3x in a row. Please fix! 

Hello @Darkduhtank.

 

In order for Raikou to spawn, you need to defeat the Raikou Guardian while also having the Zap Bell. To get the Zap Bell, you'll need to speak with Scientist Ray at the Bell Tower in Ecruteak City after making the Legendary Beasts flee from their respective areas. Here is a full guide for the Legendary Beasts quest.

After acquiring the Zap Bell, there is a 16.6% chance for Raikou to spawn each time you defeat the Raikou Guardian. The third consecutive win will result in a guaranteed spawn.

 

I hope this clarifies things. If not, or if you have further questions, please let me know.