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Then the third gym leader uses Bug types, and you conveniently find Darumakka in the next route! And for Elesa, there's Sandile in the same route! For Clay, you find Ducklett on the bridge. For Skyla, you go through a cave swarming with Electric types plus Boldore (which also comes in handy) and Gear (which can learn Electric attacks; remember you fought Elesa earlier). For Brycen, you'll be finding Boldore more common in Twist Mountain or whatever it's called, Litwick in the tower in that one route, and I think a Fighting type or two? Finally, for Iris/Drayden you can find Druddigon right by Dragonspiral, Axew in Mistralton Cave, and quite a few Ice types in Twist Mountain.
THEN you have the E4. Shauntel, meet Deino, conveniently found in Victory Road, and Vullaby, found in the outskirts of Victory Road. Grimsley, meet Mienfoo, also found on Victory Road and earlier. Caitlin, have I told you about Deino yet? Well, there's Durant too. And Marshal... Meet Woobat, your worst nightmare, found in Victory Road.
Quite convenient, I must say. And then you're allowed to add the legendary Dragon to your team right before fighting N and his legendary dragon. /once I get my two Dragons back to White he is GOING DOWN //seriously thinking of getting Zweilous to level 63 for data on White + one level 'til evolving