The England international loves training against the Belgian striker.
Stones has been commenting on how training against the Belgian striking sensation has helped him become a better player and he also believes that he and his defensive team-mates are helping the former Chelsea striker improve as well:
"Rom's an all-rounder - he's very powerful, he's got good feet, he's good in the box, good in the air and it's great practice for me to mark him and try to defend him in training.
"Playing against someone like him every day is only going to help my game and hopefully we, as defenders, can help his as well.
"We're always trying different things to stop him and I'm sure he's benefitting from that."
Lukaku was on loan at Everton from Chelsea last season, scoring 16 goals in an impressive spell at the club. That form saw Everton delve deep into their coffers for his permanent services. They paid a club record £28 million to snap up the bulky striker, according to an official press release from the club at the time of his signature.
Stones on the other hands was a comparative bargain. He cost a fee in the region of £3 million, according to the BBC, back in 2013, but both players have gone on to become two of the most important members of the Everton team in recent weeks.
Both are talented, young and internationally recognised so the idea of them grappling in training every day is certainly an exciting one.
If they can both force improvements on one another's games in the coming weeks and months, there is little doubt that Everton will be reaping the benefits for a while yet.