Here's a description of each of the eight Eeveelutions with their respective elemental themes and the addition of hydraulic press elements:

1. Vaporeon (Water-Type): Vaporeon, possesses pressurized water jets, hydraulic limbs, hydraulic resilience, water press compression, and a hydraulic reservoir. It remains a formidable aquatic creature, now enhanced with the power of hydraulic technology.

2. Jolteon (Electric-Type): Jolteon now incorporates electrically charged hydraulic components. It generates electrified water jets, has electrically reinforced hydraulic limbs, and harnesses hydraulic compression to release electrifying water-based attacks.

3. Flareon (Fire-Type): Flareon's fiery nature is combined with hydraulic mechanisms. It can expel pressurized streams of superheated water, has hydraulic limbs capable of withstanding intense heat, and can compress and release scalding water with great force.

4. Espeon (Psychic-Type): Espeon's psychic abilities are further enhanced with hydraulic press features. It can create hydraulic waves with psychic energy, has hydraulic limbs for precise psychic manipulations, and utilizes hydraulic compression to amplify its psychic attacks.

5. Umbreon (Dark-Type): Umbreon now possesses shadow-infused hydraulic press elements. It can cloak itself in pressurized darkness, has hydraulic limbs that channel dark energy, and uses hydraulic compression to unleash powerful shadow-based attacks.

6. Leafeon (Grass-Type): Leafeon incorporates hydraulic press mechanisms into its natural affinity for plants. It can release pressurized jets of nutrient-rich water, has hydraulic limbs that aid in precise plant manipulation, and utilizes hydraulic compression to enhance its grass-based abilities.

7. Glaceon (Ice-Type): Glaceon's icy nature intertwines with hydraulic press elements. It can create pressurized ice shards, has hydraulic limbs that facilitate precise ice manipulation, and utilizes hydraulic compression to amplify the freezing power of its icy attacks.

8. Sylveon (Fairy-Type): Sylveon's fairy-like grace is combined with delicate hydraulic press features. It can release gentle yet pressurized streams of fairy energy, has hydraulic limbs that aid in graceful movements, and uses hydraulic compression to enhance the impact of its fairy-based abilities.

In this alternate universe, each Eeveelution possesses its respective elemental theme while incorporating unique hydraulic press elements. They become even more formidable with the addition of hydraulic technology, making them a force to be reckoned with in their respective environments.