Feraligatr is a pure Water-type physical attacker with a base 105 Attack, solid 100 Defense, and a middling 78 Speed. That stat spread makes its nature choice genuinely consequential — the wrong pick can leave it too slow to sweep or too weak to break through bulky targets after setup.
Quick answer: Jolly (+Speed, −Sp. Atk) is the standard competitive pick for most Feraligatr sets, but Adamant (+Attack, −Sp. Atk) is a strong alternative when maximum damage matters more than outspeeding specific threats.

Why Jolly is the default competitive nature
Feraligatr's 78 base Speed is its biggest liability. After a single Dragon Dance boost (+1 Attack, +1 Speed), a Jolly nature with 252 Speed EVs lets it outrun Pokemon like Infernape and Cobalion. Without Jolly, those matchups flip, and Feraligatr gets revenge-killed before it can do anything meaningful.
The Speed gap becomes even more critical on Agility sets, which raise Speed by two stages instead of one. A Jolly Agility Feraligatr can outpace an entire tier, including common Choice Scarf users. Running Adamant on an Agility set leaves it outsped by Choice Scarf Latias and Infernape even after the boost — a dealbreaker for a set designed to clean late-game.
Both Jolly and Adamant lower Special Attack, which is ideal. Feraligatr's 79 base Sp. Atk goes almost entirely unused on competitive sets, so the stat reduction costs nothing.

When Adamant makes sense
Adamant trades that Speed insurance for noticeably harder hits across the board. Feraligatr's Sheer Force ability, combined with a Life Orb, already provides a 1.69× damage multiplier on moves with secondary effects like Liquidation, Ice Punch, and Crunch — and Life Orb recoil is negated on those attacks. Stacking Adamant on top of that turns Feraligatr into a genuine wallbreaker that can muscle through targets a Jolly variant would only 3HKO.
Adamant is the better call when your team already handles Feraligatr's Speed problem. Sticky Web support, Tailwind, or paralysis spreading from teammates can compensate for the missing Speed investment. If Feraligatr doesn't need to outrun anything at +1 because the opposing fast threats are already slowed or removed, Adamant simply does more work.
Some Swords Dance sets also lean toward Adamant. Since Swords Dance only boosts Attack (not Speed), these builds accept that Feraligatr will be slower and instead aim to hit as hard as physically possible in a single turn. Paired with Sticky Web or on a dedicated rain team where Feraligatr's Water STAB is already boosted, Adamant Swords Dance sets can punch enormous holes.

Nature recommendations by game and format
| Context | Recommended Nature | Reasoning |
|---|---|---|
| Competitive singles (Dragon Dance) | Jolly (primary) or Adamant | Jolly outspeeds key threats at +1; Adamant hits harder but risks being outsped |
| Competitive singles (Agility) | Jolly | Must outrun Choice Scarf users at +2; Adamant fails against Scarf Latias and Infernape |
| Competitive singles (Swords Dance) | Adamant or Jolly | Adamant preferred for raw power; Jolly if no speed support on team |
| VGC / Doubles | Jolly | Speed control is critical in doubles; Dragon Dance + Protect is the standard shell |
| Pokémon Legends: Z-A (story) | Adamant or Jolly | Both work; Adamant gives more immediate damage for story content |
| HGSS / in-game playthrough | Adamant | Speed benchmarks matter less in-game; raw Attack clears fights faster |
Alternative natures for casual play
Lonely (+Attack, −Defense) and Naughty (+Attack, −Sp. Def) both raise Attack, but they cut into Feraligatr's defensive stats instead of its unused Special Attack. For a story playthrough where you just want big numbers, they technically work — Feraligatr still hits hard. The tradeoff is taking more damage from physical or special attacks, respectively, which makes harder post-game content and competitive battles significantly riskier. Stick with Adamant or Jolly if you plan to use Feraligatr beyond the main campaign.

Fixing a bad nature with Mints
If your Feraligatr already has a suboptimal nature, you don't need to breed or catch a new one in most modern games. Mints change the stat effects of a nature without altering the nature label itself. In Pokémon Legends: Z-A, Mints are available at shops throughout the game. In Scarlet and Violet, you can buy them with BP at Chansey Supply stores. In Brilliant Diamond and Shining Pearl, the Battle Tower sells them. Grab an Adamant Mint or Jolly Mint and apply it to instantly correct your Feraligatr's stat distribution.
How the nature interacts with Sheer Force and Life Orb
The Sheer Force plus Life Orb combination is central to why Feraligatr's nature matters so much. Sheer Force boosts the power of moves with secondary effects by 1.3× and simultaneously removes those secondary effects. When holding a Life Orb, Sheer Force also negates the usual 10% HP recoil on those boosted moves. The result is a free 1.69× damage multiplier on Liquidation, Ice Punch, Crunch, and Rock Slide — with zero chip damage to Feraligatr.
An Adamant nature pushes that already-massive multiplier even further, making each hit devastating. A Jolly nature sacrifices a small slice of that damage ceiling to ensure Feraligatr actually gets to move before the opponent. The "right" answer depends entirely on what your team needs Feraligatr to do — break walls or sweep cleanly.

Feraligatr's nature choice ultimately comes down to a simple question: does your team handle its Speed problem, or does Feraligatr need to handle it alone? If you have speed control support, go Adamant and enjoy the raw power. If Feraligatr is your primary sweeper and needs to outrun threats after a single boost, Jolly is the safer and more consistent pick.