Hi this is the creator of ark: survival evolved We will keep this passive

You can use sarcos,ichtisaurus to make the mantas close to the basi grt distracted but if u wanna kill the mantas u can bring a spino and bring the mantas to land and the kill them with the spino or use a Meg and other options are another basi,plesiosaurus sarcosuchis(high lv with health) and a baryonix the basi eats Meat i use normal Meat cuz im too laxy to searh for prime but u can use prime if u want hope this helped:).

Can you wear bug repellent and them tame these?

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1. Approach it

2. Feed it meat ( any kind )

3. Repeat the process

Bonus tip: there may be aggressive organisms near the Basilosaurus ( so be careful and turn the Dino damage to 0 so the they can’t attack you )