The elephant outweighs the grizzly 15:1 — the bear can't generate enough damage to matter.
The grizzly bear is one of the most powerful land predators alive, but the African elephant exists in a completely different size category. At 14,000 pounds versus the grizzly's 900, the elephant can simply tramble the bear or impale it with tusks.
The grizzly's claws and bite, devastating against prey its own size, can't penetrate the elephant's thick hide effectively. Meanwhile, a single tusk strike or trunk slap from the elephant delivers several tons of force — more than enough to cripple or kill the bear.
In regions where bears and elephants have historical overlap (Asian elephants and Asiatic black bears), the bears universally defer to elephants.
15:1 weight advantage with near-impenetrable hide. Tusks and trunk provide devastating weapons. A single charge generates enough force to flip vehicles. The grizzly's best attacks are superficial scratches against the elephant's armor.
The grizzly is faster and more agile, with sharp claws and a powerful bite. It could theoretically target the trunk or legs. But none of these attacks would be significant enough to bring down a 7-ton animal.
The elephant wins overwhelmingly. The size gap is simply too extreme for the grizzly's formidable predator toolkit to overcome.
African Elephant also fights
Grizzly Bear also fights